chem 8 3

What is the molar mass of aspartic acid, C₄O₄H₇N?

133 g/mol

An organic compound which has the empirical formula CHO has a molar mass of 232 g/mol. The molecular formula of the compound is:

a.) CHO

b.) C₄H₄O₄

c.) C₂H₂O₂

d.) C₈H₈O₈

d.) C₈H₈O₈

What is the mass of 0.500 mol of dichlorodifluoromethane, CF₂Cl₂?

60.5 g

What is the mass of one atom of the element hydrogen?

1.7 × 10^(24) g

Calculate the number of moles of oxygen atoms in 35.2 g of oxygen gas.

2.20 moles

What is the molecular formula for a compound that is 46.16% carbon, 5.16% hydrogen and 48.68% fluorine if the molar mass of this compound is 156.12 g?

a.) C₆H₈F₄

b.) C₆H₆F₃

c.) C₅H₁₀F₅

d.) None of the other answers is correct.

e.) C₃H₄F₂

a.) C₆H₈F₄

What is the empirical formula for a compound that contains 17.34% hydrogen and 82.66% carbon?

C₂H₅

What is the mass of a single chlorine molecule?

1.177 × 10^(-22) g

What is the molar mass of iron (III) hydroxide?

107 g/mol

Number of atoms of oxygen present in 10.6 g Na₂CO₃ will be:

12.0 × 10²²

6.02 × 10²²

1.81 × 10²²

31.8 × 10²³

1.81 × 10²²

How many moles of POCl₃ are there in 10.0 grams of POCl₃?

6.51 × 10^-2 mol

What mass of iron is contained in 86.6 grams of pyrite, FeS₂?

40.3 g

Which has the highest percent mass of Cl?

CCl4

Which one of the following contains 35% carbon by mass?

CH3F

Which has maximum number of atoms?

24 g of 12C

What is the mass of 8.50 × 10²² molecules of NH₃?

2.40 g

What is the molar mass of hydrogen gas?

2.02 g/mol

How many atoms of carbon are present in 34.5 g of caffeine, C₈H₁₀N₄O₂?

8.57 × 10²³ atoms

How many iron (II) ions are there in 5.00 g of iron (II) sulfate?

1.98 × 10²² ions

How many cations are in 10.0 g of sodium phosphate?

1.10 × 10²³ cations

How many moles of tungsten are 4.8 x 1025 atoms of tungsten?

8.0 x 101 mol

If 2.68 g of hydrated sodium sulfate, Na2SO4.nH2O, on heating produces 1.26 g of water, what is the percent water of this compound?

47.02%

Determine the number of sulfur atoms in 27.1 g of molecular sulfur (S8).

5.09 × 1023 atoms

What is the molar mass of Co(NO3)2?

183 g/mol

Which element has a molar mass of 30.974 g/mol?

phosphorus

If 1.4% of the mass of a human is calcium, how many kilograms of Ca are there in a 185 pound man?

1.2 kg Ca

One mole of (NH4)2HPO4 contains how many moles of hydrogen atoms?

9

What is the mass percent of nitrogen in ammonium carbonate, (NH4)2CO3?

29.16%

Calculate the formula weight of sodium sulfate.

142 amu

How many hydrogen atoms are represented in the formula (CH3)2CH2?

8