Chapter 6 Chemistry 109

What is the molar mass of FeCl2? What is the molar mass of FeCl3?

126.75 g/mol 162.20 g/mol

What mass of H20 is produced by the reaction of 2.35 mol of H3PO4?

127 g

How many moles of Oxygen react with Hydrogen to produce 27.6 mol of H20?

13.8 mol O2

If a sample consists of 2.5 mol of ethanol (C2H6O) how many moles of carbon atoms, hydrogen atoms, and oxygen atoms does it have?

15 mol of H atoms and 2.5 mol of O atoms.

Aspirin (C9H8O4) is an analgesic (painkiller) and antipyretic (fever reducer). What is the molar mass of aspirin?

180.17 g/mol

What is the mass of 20.77 mol of CaCO3?

2,079 g

Cortisone is a synthetic steroid that is used as an anti-inflammatory drug. How many moles of cortisone are present in one 10.0 mg tablet?

2.77 x 10^-5 mol

What is the molar mass of Si? What is the molar mass of U?

28.09 g/mol 238.00 g/mol

How many moles of NaCl can be formed if 3.77 mol of NaOH were to react?

3.14 mol

A biochemist needs 0.00655 mol of bilirubin. How many grams of bilirubin will that be?

3.83 g bilirubin

What is the mass of 6.24 x 10^4 mol of Cl2 gas?

4.42 x 10^6 g

How many grams of CO2 are produced if 2.09 mol of HCl are reacted?

46.0 g CO2

What is the mass of 8.603 mol of Fe metal?

480.5 g

How many moles of each type of atom are in 2.58 mol of Na2SO4?

5.16 mol of Na atoms, 2.58 mol of S atoms, and 10.32 mol of O atoms.

What is the molar mass of (NH4)2S ? What is the molar mass of Ca(OH)2 ?

68.15 g/mol 74.10 g/mol

How many grams of HCl are produced by the reaction of 100.0 g of CH4?

908.7 g HCl

What is a mole?

A mole is 6.022 x 10^23 things.

How are molar masses of compounds determined?

Molar masses of compounds are calculated by adding the molar masses of their atoms.

How are moler masses of the elements determined?

Molar masses of the elements are the same numeric value as the masses of single atom in atomic mass units but with different units, grams (per one mole).

What is the mass of 1 mol of each substance? NaCl and Bilirubin (C33H36N4O6)

The mass of 1 mol of NaCl is 58.45 g and the mass of 1 mol of bilirubin is 584.69 g.

What is the mass of 3.987 mol of Al?

107.6 g Al

How many moles are present in 977.4 g of NaHCO3?

11.63 mol

A lethal dose of arsenic is 1.00 x 10^21 atoms. How many moles of arsenic is this?

0.00166 mol (or 1.66 x 10^-3 mol)

How many molecules are in 16.8 mol of H2O?

1.01 x 10^25 molecules.

An intravenous solution of normal saline may contain 1.72 mol of sodium chloride (NaCl). How many sodium ions and chloride ions are present in the solution?

1.04 x 10^24 Na+ ions and 1.04 x 10^24 Cl- ions

How many formula units are present in 2.34 mol of CaCl2? How many ions are in 2.34 mol?

1.41 x 10^24 CaCl2 units and 4.23 x 10^24 ions.