Answer:
You can get to the answer in two steps:
calculate: 3.40⋅1022 atoms = x mol ?
using Avogadro's constant.
calculate: x mol = ? grams,
using the atomic mass of Helium.
Step 1
Avogadro's constant says that 1 mole of any atom contains 6.022⋅1023 atoms. In this case you have 3.40⋅1022 atoms:
3.40⋅1022atoms6.022⋅1023atomsmol = 5.65⋅10−2mol
Step 2
The atomic mass of helium (He) will give you the weight of one mole of this molecule: 1 mol = 4.00 gram:
4.00gmol⋅5.65⋅10−2mol = 0.226g
So the 3.40⋅1022 helium atoms weigh 0.226 gram.
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Which functional group is found in an ester?
O=0
R R
O=0
o
с
/
R
OR'
R- OH
O
Answer:
second option
O=C-OR
R
Explanation:
ester: A compound most often formed by the condensation of an alcohol and an acid, with elimination of water. It contains the functional group C=O. joined via carbon to another oxygen atom.
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what occurs when the moon moves through Earth's shadow
Answer:
A Lunar eclipse
Explanation:
A Lunar eclipse occurs only when the sun,earth and moon are exactly aligned with earth .
This can be viewed twice in calendar years.
It's a Lunar Eclipse.
A lunar eclipse is the blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon. A lunar eclipse occurs when the Moon enters the Earth's shadow. A solar eclipse occurs when the Moon's shadow falls on the Earth. They do not happen every month because the Earth's orbit around the sun is not in the same plane as the Moon's orbit around the Earth.
Running the reaction at 60 C would cause the reaction to...
a. Run SLOWER than normal.
b. Run FASTER than normal.
Answer:
b. Run FASTER than normal.
Explanation:
Standard temperature is 273 K or 0°C.
Hence, running the reaction at 60°C, which is higher than normal, would cause the reaction to run faster than normal.
What does it depend on ?
Answer: According to the molecular orbital theory the shape and size of molecular orbital depends upon- Shape and size of combining atomic orbitals.
Explanation:
How many moles of fluorine atoms are present in a sample that contains 4.14 moles of ?
SF4 mol
Answer:
The Avogadro number
One mole of atoms contains 6 x 10 23 atoms, no matter what element it is
Explanation:
PLEASE HELP!! 30 PTS
Identify the combination reaction.
1.) 2H 2 + O 2 ⟶ 2H 2O
2.) Cl 2 + 2KBr ⟶ 2KCl + Br 2
3.) Al 2S 3 ⟶ 2Al + 3S
4.) C 4H 12 + 7O 2 ⟶ 6H 2O + 4CO 2
Answer:
1.) 2H2 + O2=2H2O
2.)Cl2 + 2KBr= 2KCl + Br2
4.)C4H12 + 7O2= 6H2O + 4 CO2
How many grams of rubidium are in 2.39 x 1024 atoms of rubidium?
Answer:
339 grams Rb
Explanation:
To find the final answer, you need to (1) convert atoms to moles (via Avogadro's number) and then (2) convert moles to grams (via molar mass from periodic table).
Molar Mass (Rb) = 85.468 g/mol
2.39 x 10²⁴ atoms Rb 1 mole 85.468 g
------------------------------- x ----------------------------- x -------------------- = 339 g Rb
6.022 x 10²³ atoms 1 mole
What does the word transfer mean?
A. To move from one place to another
B. To block energy flow
C. To move for a new job
D. To move to a warmer place
Group of answer choices
Answer: i think its A.
Explanation: hope it helps :>
What is the boiling point of c
Answer:
90 degree is the boiling point of c
In which state do molecules have the highest kinetic energy? A. in the liquid state B. in the solid state
Turns Red Litmus paper to BLUE (Blue stays BLUE)
A.) calcium chloride
B.) citric acid
C.) glucose
D.) calcium hydroxide
You are on a camping trip with your family. While you’re toasting marshmallows, one catches on fire.
List three more items that you might have on a camping trip that would burn.
List three items that wouldn’t burn.
The proposed mechanism for a reaction is:
Step 1: A+B= X(fast)
Step 2: X+C - Y(slow)
Step 3: Y - D (fast)
Which rate law is consistent with this mechanism?
-
O A.
rate = k[A][B]
ОВ.
rate = K[X][C]
O C.
rate = k[A][B][C]
OD.
rate = k[X][Y]
=
Answer:
rate = k[X][C]
Explanation:
When you are solving for rate law, you are only looking at the reactants of the slow reaction. In this case, step 2 is the slow one. Since there is only one X and one C on the reactants side, the coefficient in the rate law would each be one, which you don't need to include, as it is assumed.
Using the solubility curve above, what is the solubility of KBr when the temperature is 80°C?
A) 86 g/100 g water
B) 90 g/100 g water
C) 96 g/100 g water
D) 102 g/100 g water
Answer:
C) 96 g/100 g water
Explanation:
If you look for 80°C in x axis and move up from their until you hit the line for KBr, you will see that you hit the KBr line b/w (90-100 in y-axis) thus the closest answer is C) 96 g/100 g water
How many moles of NaCl are in 5.0 L of a 0.200 M solution?
Answer:
0.1 moles
Explanation:
moles=5.0×0.200
Heat from a fire place is transferred out to the room it How does the heat from the fire place transfer out to the room?
A 30:70 (mole %) ratio of acetone:water is heated to 54.36 ∘C at 760 mmHg. What is the total vapor pressure of the system? The vapor pressures for acetone and water at 54.36 ∘C are 712 mmHg and 154 mmHg respectively.
Answer:
numbers
Explanation:
idek im just bored
What is the formula mass
Answer:
mass is always constant for a body.
Explanation:
one way to calculate mass is Mass=Volume ×Density
What is the change in temperature of 150 grams of water when gains 500 Joules of energy?. The Cp for
water is 4.18 J/gxC
The change in temperature of 150 grams of water when gains 500 Joules of energy is 0.797 °C
What is Heat Transfer ?Heat transfer is defined as the process in which the molecules are moved from the region of higher temperature to lower temperature.
The heat transfer can be calculated by the formula
[tex]Q=m \times c \times \Delta T[/tex]
Here, Q is the heat supplied to the system,
m is the mass of the system,
c is the specific heat capacity of the system and
Δ T is the change in temperature of the system.
Substituting the values in the equation
m = 150g
Q=500 Joules
[tex]\rm c_{p}[/tex] = 4.18 J/gxC
500 = 150 * 4.18* Δ T
Δ T = 0.797 °C
Therefore the change in temperature of 150 grams of water when gains 500 Joules of energy is 0.797 °C .
To know more about Heat Transfer
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help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
b
Explanation:
i beleave the answer is b i read it and it looks like the best option hope it helps
According to one acid base theory the water acts as ?
What mass of Al2O3 is formed in the reaction of 4700 kg of aluminum?
Answer in units of kg
Answer:
2350kg of Al₂O₃
Explanation:
Step 1 : Write the balanced chemical equation:
4Al + 3O₂ → 2Al₂O₃
Step 2: Find the Ratio of Al : Al₂O₃
Al : Al₂O₃
4 : 2
2 : 1
4700: 2350
= 2350kg of Al₂O₃
When did Stone become interested in caving?
As a child
In high school
During college
After he was 30 years old
Answer:
William Stone (American Caver) became interested in caving in High school .
Why are prefixes often added to si units
Answer:
b
Explanation:
b
High-pressure liquid chromatography (HPLC) is a method used in chemistry and biochemistry to purify chemical substances. The pressure used in this procedure range from around 500 kilopascals (500,000 Pa) to about 60,000 kPa (60,000,000 Pa). It is often convenient to know the pressure in torr. If an HPLC procedure is running at a pressure of 5.17x10^8 Pa, what is it’s running pressure in torr?
What state of matter is it ?
Answer:
aqueous
Explanation:
How many moles of nitrogen atoms are there in 1.64 x 1023 molecules of dinitrogen trichloride, N2Cl3?
The number of moles of nitrogen atoms are there in 1.64 x 1023 molecules of dinitrogen trichloride is 0.544.
What are a number of moles?The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
1 mole is 6.022 × 10²³
[tex]1\; molecule = \dfrac{1}{6.023 \times 10^2^3}[/tex]
The given number of moles are 1.64 x 10²³
[tex]1.64 \times 10^2^3= \dfrac{1}{6.023 \times 10^2^3} = 0.272 \\[/tex]
Now, there are two molecules of nitrogen in the dinitrogen trichloride
So, 0.272 x 2 = 0.544
Thus, the number of moles of nitrogen atoms are there in 1.64 x 1023 molecules of dinitrogen trichloride is 0.544.
Learn more about dinitrogen trichloride
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A sample of argon (Ar) gas has a volume of 7.31 L at a pressure of
735 mm Hg and a temperature of 45 C. Determine the volume in
liters when the temperature changes to 55 C and the pressure
changes to 325 mm Hg.
Answer:
17.1 L
Explanation:
P1V1/T1 = P2V2/T2 T is in K
P1V1/T1 * T2/P2 = V2
735 * 7.31 / (45+273.15) * (55+ 273.15)/325 = V2
V2 = 17.1 L
which of the following provide evidence of plate motion?
A. shapes of the continents
B. fossil s of the same species found on multiple continents
C. the age distribution of basalt at mid ocean ridges
D. the size of the continents
Answer:
The following evidences of plate motion are:
offset of rocks along the San Andres fault.
the age distribution of basalt at mid-ocean ridges.
the age distribution of the Hawaiian Islands
Which has a higher metallic character?
A)Lithium
B)calcium
Please explain your answer
Answer:
Lithium
Explanation:
lithium because metallic character decreases down the group and lithium comes before in group then calcium