Answer The mass in grams for 25 atoms W is 763.10e-23.
The W is a symbol of tungsten. 25 atoms of tungsten gives 4596 mass in gram.
What are atoms?Atoms can be defined as the smallest unit into which matter can be divided without release of electrically charged particle. It is the smallest unit that form chemical elements.
Atoms are made up of electron, protons and neutrons.
To calculate mass in gram for an atom is
Mass in gram = number of atoms x atomic mass
Atomic mass of W i.e. tungsten is 183.84 u.
So mass in gram of W = 25 atoms x 183.84 u
= 4596 g
Thus, W is a symbol of tungsten. 25 atoms of tungsten gives 4596 mass in gram.
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Calculate the quantity of energy required to change 7.72 mol of liquid water to steam at 100oC. The molar heat of vaporization of water is 40.6 kJ/mol. A. 77.2 kJ B. 40.6 kJ C. 48.3 kJ D. 313 kJ E. 5.26 kJ
Answer:
D. 313 kJ.
Explanation:
Hello!
In this case, since the latent heat of a substance is that heat it releases or absorbs during a phase transition among solid, liquid and gas phases, it is given that it is computed as shown below:
[tex]Q=n*\Delta H_{change}[/tex]
Whereas n are the moles of the substance and the ΔH of change is referred to freezing, melting, condensation, vaporization, sublimation or deposition; therefore, for the vaporization of those gien 7.72 mol of liquid water we obtain:
[tex]Q=7.72mol*40.6kJ/mol\\\\Q=313kJ[/tex]
So the answer is D. 313 kJ.
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Four gases are described below:
Gas A: 5 liters at 20 °C
Gas B: 5 liters at 10 °C
Gas C: 5 liters at 40 °C
Gas D: 5 liters at 30 °C
Which gas has the greatest average molecular kinetic energy?
Gas A
Gas B
Gas C
Gas D
Answer:
B, Gas B.
Explanation:
Which form of energy is associated with the random motion of particles in a gas?
Answer:
Please mark as brainliest
Explanation:
Ans: Kinetic energy
Another example of kinetic energy is the energy associated with the constant, random bouncing of atoms or molecules. This is also called thermal energy – the greater the thermal energy, the greater the kinetic energy of atomic motion, and vice versa
The energy associated with the random motion of particles in a gas is kinetic energy.
• A form of energy, which an object or a particle possesses due to its motion is known as kinetic energy.
• It is a characteristic of a moving particle or object and relies not only upon its motion but also on its mass.
• The particles of solid are closely packed and thus they cannot move around, therefore, they possess the least kinetic energy.
• The particles of a liquid are less closely clustered, thus they move around and therefore possess more kinetic energy in comparison to solids.
• The gas particles are very loosely packed and possess the tendency to move around spontaneously, and therefore, possess very large kinetic energy.
Thus, kinetic energy is a form of energy associated with the random motion of gas particles.
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We saw in the calorimeter experiment that the combustion of a fuel is exothermic. what can you then say about the formation of a fuel?
Answer:
This question appear incomplete
Explanation:
This question appear incomplete. However, fuel is formed through a natural phenomenon involving the conversion of large amount dead and decayed organisms (usually algae and zooplanktons) to combustible fuel through exposure to relatively high temperature and pressure (over millions of years) in the earth's crust. Thus, since this involves a sort of absorption of heat energy (from the earth's crust), it can be referred to be an endothermic reaction.
one tuesday morning,you felt the room shaking while inside the class.the things inside the classroom move.the school bell rings.students are shouting.what will you do?
Answer:
seek shelter under a desk
Explanation:
you may not know whats going on and safety is key. as a teacher they should help calm children down
Explain the trend in the melting temperatures of the following tetrahedral molecules: a.CF4, 90 K b. CCl4, 250 K c. CBr4, 350 K d. CI4, 440K
Answer:
Explanation:
Intermolecular forces are the forces that hold the molecules together in a substance. The state in which this substance will be at normal atmospheric conditions, and other physical properties such as boiling and melting points, are a consequence of the intermolecular forces.
The type of intermolecular force that happens in nonpolar compounds is dispersion forces. The atom or nonpolar molecule will be disturbed by the proximity of an ion or a polar molecule, thus shifting its electron cloud. The atom or nonpolar molecule will be an induced dipole.
In these tetrahedral molecules, which are not polar, the attractive forces will be London forces, which arise as a consequence of temporary induced dipoles.
Since these forces depend on proximity (the closer the proximity the larger the attraction) those molecules with a higher molar mass will have a larger electron cloud, which will be more susceptible to the effect of an induced dipole in the surroundings (the electrons are on the outer layers will be less attracted by the nuclei).
CF₄ > CCl₄ > CBr₄ >Cl₄
--------------------------------> Increasing size
--------------------------------> Increasing melting point
The melting point increases as the molecules get bigger, that is, as the number of molecules in the molecule increases.
What is Bronsted-Lowry definitions an acid
Explanation:
The Brønsted–Lowry theory is an acid–base reaction theory which was proposed independently by Johannes Nicolaus Brønsted and Thomas Martin Lowry in 1923
when water vaporizes into the air, it becomes humid out.
Answer:
whats the question
Explanation:
what remains the same during a chemical reaction
A badly tuned automobile engine can release about 50 moles of carbon monoxide per hour. At 35 ◦C, what volume of carbon monoxide is released in a six-hour period if the atmospheric pressure is 740 Torr?
Answer:
7.79 × 10³ L
Explanation:
Step 1: Calculate the total number of moles of carbon dioxide released
50 moles of carbon dioxide are released per hour. The moles released in a six-hour period is:
6 h × 50 mol/1 h = 300 mol
Step 2: Convert the temperature to the Kelvin scale
When working with gases, we need to consider the absolute temperature. We can convert from Celsius to Kelvin using the following expression.
K = °C + 273.15
K = 35 °C + 273.15 = 308 K
Step 3: Convert the pressure to atm
We will use the conversion factor 1 atm = 760 Torr.
740 Torr × 1 atm/760 Torr = 0.974 atm
Step 4: Calculate the volume of the gas
We will use the ideal gas equation.
P × V = n × R × T
V = n × R × T / P
V = 300 mol × (0.0821 atm.L/mol.K) × 308 K / 0.974 atm
V = 7.79 × 10³ L
What is the molar concentration of Pb+ in a solution that contains 6.73 ppm of
Pb(NO3)2?
Answer with correct number of S.F.
(Hint: the unit of your answer is mol/L = M)
Answer:
Answer:
2.03 × 10⁻⁵ M
Explanation:
Step 1: Given data
Concentration of Pb(NO₃)₂: 6.73 ppm = 6.73 mg/L
Step 2: Convert 6.73 mg/L to mol/L
The molar mass of 331.2 g/mol.
6.73 × 10⁻³ g/L × 1 mol/331.2 g = 2.03 × 10⁻⁵ mol/L = 2.03 × 10⁻⁵ M
Step 3: Calculate the molar concentration of Pb²⁺
Let's consider the ionization of Pb(NO₃)₂.
Pb(NO₃)₂(aq) ⇒ Pb²⁺(aq) + 2 NO₃⁻(aq)
The molar ratio of Pb(NO₃)₂ to Pb²⁺ is 1:1. The molar concentration of Pb²⁺ is 1/1 × 2.03 × 10⁻⁵ M = 2.03 × 10⁻⁵ M.
Are you for or against transgender? why?
Explanation:
that u know right .........................
Answer:
all for it 8) !! i have several friends that are trans in fact.
Explanation:
ppl that don't support trans peeps are going to get punted into the sun with no mercy
im nonbinary, but also identify as trans too (the white stripe on the transgender flag is actually "for those who are transitioning or consider themselves having a neutral or undefined gender," according to Monica Helms, who made the most commonly seen trans flag. :] they don't all identify as trans but can if they want to.
also, a common misconception is that all nonbinary people have to/use they/them pronouns, which is not true. they can use whatever they want because pronouns do not equal gender in most cases. also because they don't have to be put into a strict box of what you can and can't use.
Why is it important to control the speed of the chain reaction in a nuclear reactor ?
Atomic bombs use much higher enrichment material with over 90% of U235 to create a massive chain reaction and produce a large amount of energy at one time. The control rods in a nuclear reactor are used to control the speed of the chain reaction and can capture free neutrons before they collide with U235 atoms.
you can thank safari. ♥
Answer:
Atomic bombs use much higher enrichment material with over 90% of U235 to create a massive chain reaction and produce a large amount of energy at one time.
Explanation:
The luminosity of the Sun is 4 x 1026 W, which means that the sun emits 4 x 1026 J of energy every second. How much mass does it change into energy every second? Express your answer in kilograms.
In fusion reactions, only a small fraction of the hydrogen mass is converted into energy. 99.3% of the hydrogen is converted into helium, and just 0.7% of the hydrogen is converted into energy. Based on this information, how much hydrogen undergoes fusion in the Sun every second? Express your answer in kilograms.
Solution :
The sun emits = [tex]$4 \times 10^{26} $[/tex] J of energy per second
= [tex]$4 \times 10^{26} \ kg m^2 s^{-3} $[/tex]
We know, [tex]$1 \ J =1 \ kg \ m^2 / s^2 $[/tex]
[tex]$E=mC^2$[/tex] , where C = [tex]$3 \times 10^8 \ m/s$[/tex]
[tex]$E=mC^2$[/tex]
[tex]$J=M(M/s)^2$[/tex]
Dividing both sides by 1 second
[tex]$\frac{J}{s}=\frac{M \times m^2 s^{-2}}{sec}$[/tex]
[tex]$\frac{J}{s}=M \times m^2 s^{-3}$[/tex]
Then, [tex]$4 \times 10^{26} \ J/s = M \times m^2 s^{-3} \times (3 \times 10^8)^2$[/tex]
[tex]$M = \frac{4 \times 10^{26}}{9 \times10^{16}}$[/tex]
[tex]$M=4.44 \times 10^9 \ kg$[/tex]
Now according to the information, 99.3% hydrogen.
If 0.7 % of hydrogen produce = [tex]$4 \times 10^{26} $[/tex] J of energy per second
Then 1% of hydrogen will produce = [tex]$\frac{4 \times 10^{26}}{0.7}$[/tex] J energy per second
So, 100% of hydrogen will produce = [tex]$\frac{4 \times 10^{26}}{0.7} \times 100$[/tex] J energy per second
= [tex]$5.7143 \times 10^{28 }$[/tex] J energy per second
Mass of hydrogen undergo fusion in sun per second
[tex]$E=mC^2$[/tex]
Similarly, [tex]$\frac{J}{s}=M \times m^2 s^{-3}$[/tex]
[tex]$5.714 \times 10^{28} \ J/s = M \times (3 \times 10^8)^2 \ m^2 \ s^{-3}$[/tex]
[tex]$M = \frac{5.7143 \times 10^{28}}{9 \times 10^{16}}$[/tex] kg
[tex]$M= 6.349 \times 10^{11}$[/tex] kg
Which type of structure would contain a few non-metal atoms?
Answer:
a simple covalent structure
Explanation:
its has a few non-metal atoms?
The concentration of ozone in a sample of air that has a partial pressure of O3 of 0.33 torr and a total pressure of air of 695 torr is ________%.
Answer:
0.047 %
Explanation:
Step 1: Given data
Partial pressure of ozone (pO₃): 0.33 torrTotal pressure of air (P): 695 torrStep 2: Calculate the %v/v of ozone in the air
Air is a mixture of gases. We can find the %v/v of ozone (a component) in the air (mixture) using the following expression.
%v/v = pO₃/P × 100%
%v/v = 0.33 torr/695 torr × 100%
%v/v = 0.047 %
Help right know
Students combined baking soda and vinegar and observe bubbles forming.
is it a chemical change or is not a chemical change?
Answer:
it is a chemical change
Explanation:
Common physical changes include melting, change of size, volume, color, density, and crystal form. The classic baking soda and vinegar reaction provides evidence of a chemical change due to the formation of a gas and a temperature change.
Silver acetate breaks into ions. How many ions would one single formula unit make if dissolved in water? a. 1b. 2c. 3 d. 4 e. none of these
Answer:
The correct answer is b) 2
Explanation:
When is dissolved in water, silver acetate (AgCH₃COO) is dissociated into ions according to the following equilibrium:
AgCH₃COO ⇄ Ag⁺ + CH₃COO⁻
Where Ag⁺ is a silver cation and CH₃COO⁻ is the acetate anion (an organic anion). As we can see, from one single formula unit are obtained 2 ions (1 cation and 1 anion).
Therefore, the correct option is b) - 2
If the pressure of 50.0mL of oxygen gas at 100 ºC increases from 735mmHg to 925mmHg, what is the final volume
Given :
The pressure of 50.0 mL of oxygen gas at 100 ºC increases from 735 mm Hg to 925 mm Hg.
Temperature remains constant.
To Find :
The final volume.
Solution :
735 mm Hg = 0.967 atm
935 mm Hg = 1.230 atm
We know, at constant temperature :
[tex]P_iV_i=P_fV_f\\\\V_f=\dfrac{P_iV_i}{P_f}\\\\V_f=\dfrac{0.967\times 50}{1.230}\\\\V_f=39.31 \ mL[/tex]
Therefore, final volume is 39.31 ml.
Hence, this is the required solution.
For the equilibrium that exists in an aqueous solution of nitrous acid (HNO2, a weak acid), the equilibrium constant expression is:_______a. K = [H+][NO2-]/[HNO2] b. K = [H+][N3+][O2-]^2/ [HNO2]c. K= [H+][NO2-] d. K = [H+]^2[NO-]/[HNO2]
Answer:
a. K = [H+][NO2-]/[HNO2]
Explanation:
The computation of the expression of the equilibrium constant is shown below:
Given that the weak acid is HNO_2 that exist in the solution that aqueous
The dissociation equation of [tex]HNO_2[/tex]
[tex]HNO_2(aq) \rightarrow NO_{2}^{-} (aq) + H^{+}(aq)[/tex]
Now
Acidionization constant i.e.
[tex]k_a = \frac{[NO_{2}^{-}][H^{+}]}{HNO_{2}}[/tex]
Therefore the correct option is a.
Hence, the same is to be considered
A gas has a volume of 5.0 L and pressure of 633 mmHg. The pressure is increased to 920 mmHg, what is the new volume in L?
Answer:
3.44 LExplanation:
The new volume can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\[/tex]
From the question we have
[tex]V_2 = \frac{5 \times 633}{920} = \frac{3165}{920} \\ = 3.440217...[/tex]
We have the final answer as
3.44 LHope this helps you
The corrosion of aluminum in cookware is prevented as the aluminum metal reacts with oxygen gas in the air producing a protective coat of aluminum oxide. Aluminum) Al+3
(Oxygen) O-2
Al + O2 ------> Product(?
a) Write the balanced equation for the reaction.
b) How many grams of oxygen gas is used in the reaction if 3.25 moles of aluminum oxide is produced?
c) How many grams of aluminum oxide will be produced by the reaction
d) If the reaction gave an actual yield of 228.4 g, what is the percent yield for the reaction?
Answer:
Explanation:
2Al + 3 O₂ = Al₂O₃
2 moles 3 moles 1 mole
b )
1 mole of aluminium oxide is produced from 3 moles of oxygen gas
3.25 moles of aluminium oxide is produced from 3 x 3.25 moles of oxygen
= 9.75 moles of oxygen
= 9.75 x 32grams of oxygen
= 312 grams of oxygen.
c )
3.25 moles of aluminium oxide = 3.25 x 102 = 331.5 grams of aluminium oxide
( molecular weight of aluminium oxide = 102 )
d ) actual yield = 228.4 gram
percent yield = 228.4 x 100 / 331.5
= 69 % approx .
2 Al + 3 O₂ = Al₂O₃
Mass of oxygen gas if 3.25 moles of aluminum oxide is produced
3 moles of oxygen gas produces 1 mole of aluminium oxide
3.25 moles of aluminium oxide is produced from 3 x 3.25 moles of oxygen which is 9.75 moles of oxygen
Mass= mole × molar mass
= 9.75 x 32g of oxygen
= 312 g of oxygen.
The grams of aluminum oxide produced will be
Mass= mole x molar mass
3.25 moles of aluminium oxide
= 3.25 x 102
= 331.5 g of aluminium oxide
Percent yield when Actual yield = 228.4g
Percent yield = 228.4 x 100 / 331.5
= 68.89 %
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In which region is there most likely to be a volcano? A.D B.B C.A D.C
Answer: A and D
Explanation:
I hope this helps. Sorry if I’m wrong
Answer:
Region D
Explanation:
The region is on the tectonic plate boundaries.
A car travels 600km in 15 hours (Speed=Distance/Time) What was the speed the car traveled at?
Answer:
40
Explanation:
D=600
S=40
T=15
600/15 = 40
What volume (mL) of 0.2173M NaOH is required to titrate 50.00mL of 0.2980M HCI?
Answer: 68.6 mL
Explanation:
We need to use the equation M1V1=M2V2. Molarity's units are in L so we need to convert the 50 ml into L (divide by 1000).
.05(.298)=(x)(.2173)
x = .068 L
to convert to mL we multiply by 1000
.068*1000=68.6 mL
Assuming that the only lons contributing to the salt content in the Dead sea is Nat
and Cl" ions, calculate the weight of NaCl(s) in 10.0 L of the sea water after
evaporation. The salt content of the Dead sea is reported as 33.7%. Give your
answer in kg.
Answer:
Answer:
3.37kg of NaCl is the salt content of the dead sea
Explanation:
A concentration of 33.7% means there are 33.7g of NaCl in 100mL of solution.
To solve this question we need to convert 10.0L to mililiters, and then, solve for the mass of NaCl in grams and convert it to kg:
Volume in milliliters:
10.0L * (1000mL / 1L) = 10000mL
Mass of NaCl:
10000mL * (33.7g NaCl / 100mL) = 3370g NaCl
In kg:
3370g * (1kg / 1000g) =
3.37kg of NaCl is the salt content of the dead seaThe law of conservation of energy states that
A. energy never changes form.
B. energy can be created but not destroyed .
C. energy can be destroyed but not created.
D. energy can neither be created nor destroyed, only change forms.
The cell process used by both plants and animals to access glucose energy is called
The cell process used by both plants and animals to access glucose energy is called Cellular respiration.
What is cellular respiration?Cellular respiration is a series of metabolic reactions and activities that occur in organisms' cells to transform chemical energy from oxygen molecules or nutrients to adenosine triphosphate.
Respiration process only take place in the animals for the removal of carbon dioxide, when the intake of oxygen is done.Photosynthesis is only done by plants to produce food.Osmosis process is not used to access glucose energy.Cellular transport is a process in which nutrients transport from one part to another part.Hence the required cell process is known as cellular respiration.
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Is Ne an atom or a molecule and is it a pure element or a
compound?
a. Atom, Molecule
b. Molecule, Pure element
c. Atom, Pure element
Answer: A Atom , molecule
Explanation:
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How much heat, in calories, is needed to raise the temperature of 125.0 g of Lead (c lead = 0.130 J/g°C) from 17.5°C to 41.1°C?