CHEM 101 Ch 6 Mastering

Calculate the molar mass for Mn2O3, an oxide of manganese.

157.88 g/mol

How many grams are in 2.80 mol of sodium chloride (NaCl)?

164 g

How many copper atoms are in a pure copper statue with a mass of 127 kg ?

1.20×10^27 Cu atoms

2.4 mol Cu

1.4×10^24 atoms

0.270 mol Na

1.63×10^23 atoms

How many grams of Cl are in a 38.0-g sample of the chlorofluorocarbon CF3Cl?

12.9 g

Calculate the molar mass of norepinephrine (C8H11NO3), a hormone that helps increase blood pressure by stimulating blood vessels to constrict.

169.18 g/mol

How many formula units make up 33.2 g of magnesium chloride (MgCl2)?

2.10×10^23 formula units of MgCl2

How many gross of copper atoms are in a penny.

2.1×10^20 gross

How many dozens of copper atoms are in a penny.

2.5×10^21 dozens

How many grams of Cl are in a 38.0-g sample of the chlorofluorocarbon C2F3Cl3?

21.6 g

How many grams of Cl are in a 38.0-g sample of the chlorofluorocarbon CF2Cl2?

22.3 g

A pure gold coin contains 0.140 mol of gold. What is its mass?

27.6 g

How many grams of Cl are in a 38.0-g sample of the chlorofluorocarbon CFCl3?

29.4 g

Determine the mass of oxygen in a 5.8-g sample of sodium bicarbonate (NaHCO3).

3.3 g

Determine the mass of oxygen in a 7.20-g sample of Al2(SO4)3.

4.04 g

7.2×10−3 mol C

4.3×10^21 atoms

How many moles of copper atoms are in a penny.

5.0×10^−2 moles

Determine the mass of iron in 79.2 g of Fe2O3.

55.4 g

How many water molecules are in a block of ice containing 1.00 mol of water (H2O)?

6.02×10^23 molecules of H2O

How many reams of copper atoms are in a penny.

6.0×10^19 reams

Calculate the mass percent composition of iron for each iron ore: Fe2O3 (hematite), Fe3O4 (magnetite), FeCO3 (siderite).

69.94% 72.36% 48.20%

A 2.45-g sample of strontium completely reacts with oxygen to form 2.89 g of strontium oxide. Use this data to calculate the mass percent composition of strontium in strontium oxide.

84.8 %

16.3 mol Hg

9.82×10^24 atoms

Given the atomic mass of select elements, calculate the molar mass of each salt.

The molar mass of MgF2 is 62.31 g/mol The molar mass of CdF2 is 150.41 g/mol The molar mass of CuF2 is 101.55 g/mol The molar mass of BeF2 is 47.01 g/mol

Which ore has the highest iron content?

magnetite