Three elements, A, Q, and Z, have the molar masses indicated in the table below. Given a compound with a composition of 15.66% A and 84.34% Z by mass, what is the empirical formula of this compound?
element symbol molar mass
A 15.45 g/mol
Q 20.05 g/mol
Z 41.62 g/mol
Answer:
AZ₂
Explanation:
The formed compound will not contain Q because mass percentages, %A and %B, form 100% of the compound.
Steps
Change % of each element into grams.Convert grams of each element into moles by dividing grams by molar mass.Divide all moles by the smallest number of moles.If the moles are all whole numbers, then you’re done and that’s your empirical formula.If not, multiply all moles by number such that everything is a whole number.Solving
We have 15.66g of A and 84.34g of ZMoles of A, n(A) = 15.66/15.45 = 1.01 molesMoles of Z, n(Z) = 84.34/41.62 = 2.02 molesA = 1.01/1.01 = 1 and Z = 2.02/1.01 = 2Therefore, the empirical formula is AZ₂Name the two geometrical isomer of hydrocarbon
Answer:
alkenes and cyclic compounds
Which of the following indicates an endothermic reaction? I will mark as brainliest if correct.
Answer:
A + B → C + D + heat
Explanation:
A. A+B+heat⇒C+D
In an endothermic reaction, the system requires energy/heat, the enthalpy change is positive.
Complete the chart on the characteristics of bonds
Answer:
Face value. Corporate bonds normally have a par value of $1,000, but this amount can be much greater for government bonds.
Interest. ...
Coupon or interest rate. ...
Maturity. ...
Issuers. ...
Rating agencies. ...
Tools and tips.
A balloon contains 7.2 L of
He. The pressure is reduced
to 2.00 atm and the balloon
expands to occupy a volume
of 25.1 L. What was the initial
pressure exerted on the
balloon?
Given:
Unknown:
Formula:
Solution:
Final Answer:
Apply Boyles law
P1V1=P2V27.2(2)=25.1P214.4=25.1P_2P_2=0.57atmRemember
If Volume is four times increased pressure is 4 times decreased
Explain the relashionship between carbon dioxide, the human population and use of fossil fuels.
Answer:
More people means more demand for oil, gas, coal and other fuels mined or drilled from below the Earth's surface that, when burned, spew enough carbon dioxide (CO2) into the atmosphere to trap warm air inside like a greenhouse
Explanation:
hope this helps
pls mark brainliest
Perform the following
mathematical operation, and
report the answer to the
correct number of significant
figures.
0.97584/5.68 = [?]
The answer to the correct number of significant figures is 0.171.
What are the significant numbers?The numbers 1 to 9 will always be significant figures. Leading zeros of a number are not significant figures. Zeros to the right of a number are significant figures.
In this case we have:
[tex]0.97584/5.68 = 0.171[/tex]
So you only need the three numbers after the dot.
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smoking cigarettes is banned in petrol stations because of the risk of explosions.
Explain why Flames can cause explosions in petrol stations even if they never come into direct contact with any liquid petrol.
help pls!
Answer:
well it is because of mainly what we call reaction the petrol are highly reactive with the flames
What is the relationship between the enthalpy (AH) and entropy (AS) of a
reaction that is spontaneous at higher temperatures but not at lower
temperatures?
The relationship between the enthalpy (ΔH) and entropy (ΔS) of a
reaction that is spontaneous at higher temperatures but not at lower
temperatures is +ΔH, - Δs.
Relationship between enthalpy and entropy
The relationship between enthalpy (ΔH) and entropy (ΔS) is given by Gibs free energy.
ΔG = ΔH - TΔs
When ΔH < 0 and Δs < 0, ΔG = -ve (-ΔH, - Δs) (for lower temperature)
Also, when ΔH < 0 and Δs = +, ΔG = -ve (-ΔH, +Δs) (for all temperature)
When ΔH > 0 and Δs < 0, ΔG = -ve (+ΔH, - Δs) (for higher temperature)
Thus, the relationship between the enthalpy (ΔH) and entropy (ΔS) of a
reaction that is spontaneous at higher temperatures but not at lower
temperatures is +ΔH, - Δs.
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When a solution is saturated, and additional solid solute is added, what happens?
Answer:
super saturation takes place.
How many liters of 4.000 M sodium bromide solution are needed to
make 0.250 L of 0.200 M sodium bromide?
Are cable wires made of thermoplastic? If so why?
(This is just a doubt that just came into my head)
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Cable wires are usually made of of thermoplastics because, current passing through the wire has heating effects as well, due to collision of electrons in the conducting wire. so to avoid the melting of normal wire which can break the circuit, Thermoplastics are used, that doesn't have much effect of heat on them.
This is an impossible formula. If it were real, determine the molar mass of:
Cr4(PO4)3
Answer:
Molar Mass (Cr₄(PO₄)₃): 492.894 g/mol
Explanation:
First, collect the individual molar masses of each element. These values are found on the periodic table under each respective element.
Chromium (Cr): 51.996 g/mol
Phosphorus (P): 30.974 g/mol
Oxygen (O): 15.999 g/mol
The quantity of each element is determined by the subscript next to it. If their is a subscript directly to the right of a set of parentheses, multiply each element within the parentheses by the subscript.
Chromium (Cr): 4
Phosphorus (P): 1 x 3 = 3
Oxygen (O): 4 x 3 = 12
Finally, the total molar mass of the compound is the collective molar masses of each element times the quantity of each element.
Molar Mass (Cr₄(PO₄)₃): 4(51.996 g/mol) + 3(30.974 g/mol) + 12(15.999 g/mol)
Molar Mass (Cr₄(PO₄)₃): 492.894 g/mol
Sugar (C12H22011) is a molecular substance. Which of the following properties would you expect it to
have?
a. conducts electricity in water
b. doesn't dissolve in water
c. held together by opposite charges
d. low melting point
Calculate the molarity of 0.060 moles NaHCO3 in 1500. mL of solution
Answer:
= 0.4 M
Explanation:
data:
moles = 0.060 moles
volume = 1500 ml
= 1500 / 1000
= 1.5 dm^3
solution;
molarity = [tex]\frac{no. of moles}{volume in dm^3}[/tex]
= 0.060 / 1.5
molarity = 0.4 M
How many significant figures
are in this number?
0.00521
The significant figures in the number 0.00521 is : 3 Significant figures.
Meaning of significant figuresSignificant figure can be defined as numbers within the number system that has value or gives value to a number list.
Significant figures are numbers that has a measure of value assigned to them as a reason of where they are placed.
In conclusion, the number above contains only three significant figures.
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# 12 of Equilibrium Constant
Consider the chemical system:
2 NO(g)
N₂(g) + O₂ (g)
K = 2.1 x 1030
How do the equilibrium concentrations of the reactant compare to the equilibrium concentration of the products?
Select one:
O a. They are much lower
O b. They are much higher
O c.
They are about the same order of magnitude
O d. They have to be exactly equal
e.
You can't tell from the information given
Answer:
of Equilibrium Constant
Consider the chemical system:
2 NO(g)
N₂(g) + O₂ (g)
K = 2.1 x 1030
How do the equilibrium concentrations of the reactant compare to the equilibrium concentration of the products?
Select one:
O a. They are much lower
O b. They are much higher
O c.
They are about the same order of magnitude
O d. They have to be exactly equal
e.
You can't tell from the information
Explanation:
of Equilibrium Constant
Consider the chemical system:
2 NO(g)
N₂(g) + O₂ (g)
K = 2.1 x 1030
How do the equilibrium concentrations of the reactant compare to the equilibrium concentration of the products?
Select one:
O a. They are much lower
O b. They are much higher
O c.
They are about the same order of magnitude
O d. They have to be exactly equal
e.
You can't tell from the information
What is the boiling point of liquid c when the
Answer:
100 degree is the answer of given statement
A 3.24-gram sample of NaHCO3 was completely decomposed in an experiment.
2NaHCO3 → Na2CO3 + H2CO3
In this experiment, carbon dioxide and water vapors combine to form H2CO3. After decomposition, the Na2CO3 had a mass of 2.19 grams.
Determine the mass of the H2CO3 produced.
Calculate the percentage yield of H2CO3 for the reaction. Show your work or describe the calculation process in detail.
PLEASE HELP, WILL MARK BRAINLIEST!!!
Mass of H2CO3 = 1.05g
Givens: NaHCO3 = 3.24
Na2CO3 = 2.19
Mass of H2CO3 = mass of NaHCO3 - mass of Na2CO3
Mass of H2CO3 = 3.24g - 2.19g
Mass of H2CO3 = 1.05g
How do you find the mass number?The number of protons and the number of neutrons combine to determine the mass number of an element. Mass number = proton + neutron. If you want to calculate the number of neutrons an atom has, you can simply subtract the number of protons or atomic numbers from the mass number.
Divide the mass of a substance in grams by the molecular weight. This will give you the number of moles of the substance in a particular mass. For 12 g of water, (25 g) / (18.015 g / mol) = 0.666 mol.
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Lab: Plate Boundaries and Movement Lab Report.
A Plate Boundaries and Movement Lab Report is a report that shows the records of all the data relating to the movement of Plate Boundaries and their movements.
What are Plates in this context?A tectonic plate is also described or referred to as a Lithosperic Plate. In Geography, it is described as a slab of rock that is not shaped regularly.
In most cases, it comprises continental and oceanic lithosphere.
Why is it crucial to record the movement of plates and their boundaries?Plate Boundaries and their movement are largely linked to volcanic activities and earthquakes. This means that they can be used to predict when any of the above-mentioned events may happen.
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4Na(s)=+O2(g)->2NA2)(s)
How many grams of Na2O is produced when 57.5g an Na reacts
In a spacecraft tge carbon dioxide exhaled by the astronaut can be removed by the reaction with lithium hydroxide, LiOH according to the following; CO2(g) + LiOH(g) = LiOH(s) + H2O(l) how many moles of Lithium hydroxide are required to react with 30 moles of CO2, average exhaled by each person
Answer:
30 moles
Explanation:
From the equation it is a one - to - one reaction
How old is a piece of cotton cloth if the half-life of carbon-14 is 5,730 years, and the carbon-14 composition of the cloth is 22 percent that of living plants?
Question 1 options:
A)
1,813 years
B)
1.21 × 10-4 years
C)
12,517 years
D)
1.21 × 10-4 years-1
The half-life is the time used by the concentration to get half of its initial value. The cotton cloth is 5097 years old.
What is radioactive decay?Radioactive decay is the reduction of the initial concentration to the half value. The exponential decay can be given as:
[tex]\rm N(t) = N_{0}e ^{-\lamda t}[/tex]
The decay constant is calculated as:
[tex]\begin{aligned} \lamda &= \rm \dfrac {ln (2)}{t\frac{1}{2}}\\\\&= \dfrac{\rm ln(2)} {5730}\\\\&= 0.0001209\end{aligned}[/tex]
Solving further:
[tex]\begin{aligned}0.22 &= \rm e^{-0.0001209 \times t}\\\\\rm ln 0.22 &= -0.0001209 \times t\\\\\rm t &= \rm \dfrac{log 0.22}{-0.0001209}\\\\&= 5097 \;\rm years\end{aligned}[/tex]
Therefore, the cotton cloth is 5097 years.
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what is the formula to find the volume of a marble
Individual marble:
4/3_?_ R^3Answer:
Individual Marble
Use the formula 4/3_?_ R^3, to solve for the volume. Here, R is the radius, or half of D. ^3 means the radius is cubed.
Explanation:
The electron configuration of an element is shown below.
1s^22s^22p^5
Name the group this element belongs to in the periodic table and explain your answer. Based on the electron configuration, explain how many electrons it is likely to receive from the atom of another element during the formation of a bond.
Answer:
Fluorine 1s2 2s2 2p5
Explanation:
it is likely to receive 1 electron
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In the periodic table, this element belongs to the 17th group. As a result, the element has a tendency to gain one electron during bond formation in order to achieve octet.
What is octet state?According to the octet rule, atoms are most stable when their valence shells contain eight electrons. The eight electrons that fill an atom's outermost shell are known as octets.The octet rule is significant because it predicts how atoms will bond based on their valence electrons' outer shells. Atoms form a certain number of bonds in order to share electrons with other atoms, resulting in an octet of eight electrons. For example, the outer shell of oxygen contains only six electrons.electronic configuration is:
[tex]1s^22s^22p^5[/tex]
The given element contains two electrons in the 2s orbital and five electrons in the 2p orbital. As a result, the energy level with n = 2 is the outermost energy level in this case. As a result, the element has 2 + 5, or 7 valence electrons. Elements with 7 valence electrons are classified as belonging to periodic table group 17.The element has 7 valence electrons, so it requires one more electron to achieve the stable octet state. As a result, the element has a tendency to gain one electron during bond formation in order to achieve octet.To learn more about octet rule, refer:
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Name the following carboxylic acid:
COOH
A. 3-ethyl-2-methylheptanoic acid
B. 2-ethyl-1-methylhexanoic acid
The name of the compound is 2-methyl-3-ethylheptanoic acid.
Naming organic compoundsLooking at the structure, the longest carbon chain is 7. Meaning that the compound is a heptanoic acid.
There are 2 branches. The first one has a single carbon (methyl) while the second one has 2 carbons (ethyl).
The methyl is located on the second carbon (2-methyl) while the ethyl is located on the third carbon (3-ethyl) on the main chain.
Thus, the name of the compound would be 2-methyl-3-ethylheptanoic acid.
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Answer:its c 3-ehtyl
Explanation:
Describe the population density located along the tectonic plate boundary known as the Ring of Fire and the potential effect that earthquakes or volcanic
activity can have in this area.
(Pls no links)
Population density is the number of specific organisms living in a particular area. The tectonic plate movements in the Ring of Fire area can cause volcanic eruptions and earthquakes.
What are tectonic plates?Tectonic plates are the parts of the crust and the mantle of the earth layer that is also called the lithosphere plate. They are not stationary and have slight movements on the mantle which comprises the hot lava.
The movement of these tectonic plates in the area of the Ring of fire causes the eruption of the lava and disrupts the crust causing an earthquake. This consequence affects the life habiting them.
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Answer:
im pretty sure because the plates move which causes these natural disasters
Explanation:
Using the periodic table, which of the elements below would be a poor conductor of electricity, be a gas, and may have a color?
a. Zinc
b. Cobalt
c. Chlorine
d. Calcium
Calculate the mass (in grams) of 3.85 x 1024 carbon atoms.
Round your answer to two decimal places.
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.
Which word equation shows lithium oxide being formed from the reaction between oxygen and lithium? oxygen lithium oxide right arrow. lithium lithium oxygen right arrow. lithium oxide oxygen lithium right arrow. lithium oxide lithium oxide right arrow. lithium oxygen
Answer:
lithium lithium (or 2lithium) + oxygen ->
Explanation:
Your welcome