Moles

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A compound has an empirical formula of HCO2 and a molecular of 90 grams per mole. What is the molecular formula of this compound?

H2C2O4

Which is the formula for the compound that forms when magnesium bonds with phosphorous?

Mg3P2

Which species represents a chemical compound?

NaHCO3

A compound contains 0.5 mole of sodium, 0.5 mole of nitrogen, and 1.0 mole of hydrogen. The empirical formula of the compound is

NaNH2

The gram-formula mass of NO2 is defined as the mass of

One mole of NO2

Which represents both an empirical and a molecular formula?

P2O5

What is the molecular formula of a compound with the empirical formula P2O5 and a gram-molecular mass of 284 grams?

P4O10

The graph shows...After 60 minutes, how many grams of water appear to remain in the salt?

0.00

What is the total number of moles of atoms present in 1 gram formula mass of Pb(C2H3O2)2

15

Which sample of O2 contains a total of 3.01 x 10^23 molecules at STP?

16.0g

The mass in grams of 1.00 mole of CaSO4 x 2H2O is

172g

What is the total number of atoms in 1.0 mole of CO2

18 x 10^23

What is the total mass of oxygen in 1.00 mole of Al2(CrO4)3?

192g

What is the ratio by mass of sulfur to oxygen in SO2?

1:1

The total number of molecules in 34.0g of NH3 is equal to

2.00 x 6.02 x 10^23

What is the total mass of 3.01 x 10^23 atoms of helium gas?

2.00g

What is the total number of atoms contained in 80g of neon?

2.4 x 10^24

The accompanying table shows...What is the percent of water in the original sample?

20%

What is the gram-molecular mass of a compound if 5 moles of the compound has a mass of 100 grams?

20g

What is the total number of atoms presented in CuSO4 x 5H2O

21

Which sample contains a total of 6.0 x 10^23 atoms?

23g Na

What is the gram-formula mass of Fe(NO3)3?

242 g/mol

What mass contains 6.0 x 10^23 atoms?

28g of silicon

What is the total number of moles of sulfur atoms in 1 mole of Fe2(SO4)3

3

Approximately how many atoms are there in 3.0 moles of Al?

3(6.0 x 10^23)

What is the total number of molecules contained in .50 mole of O2 at STP?

3.0 x 10^23

What is the gram formula mass of Ca3(PO4)2

310.g

The gram molecular mass of Ca3(PO4)2 is

310g

The percent by mass nitrogen in NH4NO3 is closest to

35%

The data shown...What is the percent of water in the hydrate?

36%

The percent by mass of water in BaCl x 2H20 is equal to

36/243 x 100

The graph shows...What is the percent of water in the original sample?

40%

What is the percent by mass of oxygen in magnesium oxide, MgO?

40%

What is the total mass in grams of 0.75 mole of SO2

48g

The percent by mass of oxygen in CO is approximately

57%

How many moles of hydrogen atoms are present in one mole of C2H4(OH)2

6

What is the total number of molecules of SO2 in a 0.10-mole sample of SO2?

6.0 x 10^22

What is the approximate total number of atoms in 1.0 mole of lithium?

6.0 x 10^23

What is the total number of molecules in 1.0 mole of Cl2(g)

6.0 x 10^23

The gram atomic mass of oxygen is 16.0 grams per mole. How many atoms of oxygen does this mass represent?

6.02 x 10^23

What is the percent composition by mass of hydrogen in NH4HCO3

6.3%

What is the percent by mass of hydrogen in CH3COOH

6.7%

What is the percent by mass of water in the hydrate Na2CO3 x 10H20

62.9%

What is the total number of hydrogen atoms required to form 1 molecule of C3H5(OH)3

8

What is the total number of moles of hydrogen atoms contained in 1 mole of (NH4)2C2O4?

8

A 1.0-mole sample of krypton gas has a mass of

84g

How many oxygen molecules are in 3.36 of gas at STP?

9.03 x 10^22

The gram-formula mass of (NH4)2CO3 is

96.0g

Given the structural formula...What is the empirical formula of this compound?

C2H5O

What is the molecular formula of a compound that has a molecular mass of 42 and an empirical formula of CH2?

C3H6

The gram molecular mass of CO2 is the same as the gram molecular mass of

C3H8

A compound has a molecular mass of 54 and an empirical formula of C2H3. What is the molecular formula of the compound?

C4H6

Which is an empirical formula?

CH

The molecular mass of a compound of carbon and hydrogen is 42. It's empirical formula is

CH2

What is the empirical formula of a compound if a sample contains 8.52 grams of carbon and 1.42 grams of hydrogen?

CH2

Which pair of formulas represents the empirical formula and the molecular formula of a compound?

CH2, C3H6

What is the empirical formula of the compound whose molecular formula is C6H12O6?

CH2O

A compound contains 40% calcium, 12% carbon, and 48% oxygen by mass. What is the empirical formula of this compound?

CaCO3

Which quantity is equivalent to 39 grams of LiF

1.5 moles

Which sample contains a total of 9.0 x 10^23 atoms

1.5 moles of Cu

How many molecules are in 0.25 mole of CO?

1.5 x 10^23

What is the number of moles of N2(g) that contains 9.03 x 10^23

1.50

What is the total number of moles of atoms represented by one mole of (CH3)2NH

10

How many moles of hydrogen atoms are there in one mole of C6H12O6 molecules?

12

The percent by mass of carbon in CO2(g) is equal to

12/44 x 100

The percent composition by mass of nitrogen in NH4OH (gram-formula mass = 35 grams/mole) is equal to

14/35 x 100

The sum of the atomic masses of the atoms in one molecule of C3H6Br2 is called the

Formula mass

In which compound is the percent composition by mass of chlorine equal to 42%?

HClO3

Which substance has the greatest molecular mass

I2

Atom X is in group IIA and atom Y is in group VIIA. A compound formed between these two elements would have the formula?

XY2


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