Chem 1010

The reaction of 25 mL of N2 gas with 75 mL of H2 gas to form ammonia via the equation: N2 (g) + 3H2 (g) → 2NH3 (g)will produce ________ mL of ammonia if pressure and temperature are kept constant.

• 100
• 250
• 150
• 50

The formula of nitrobenzene is C6H5NO2. The molecular weight of this compound is ________ g/mol.

• 109.1
• 3.06
• 43.03
• 123.11

The mass % of C in methane (CH4) is ________.

• 92.26
• 133.6
• 7.743
• 74.87

Calculate the percentage by mass of nitrogen in PtCl2(NH3)2.

• 4.95
• 9.9
• 4.67
• 9.34

A 30.5 gram sample of glucose (C6H12O6) contains ________ mol of glucose.

• 5.9
• 0.169
• 0.136
• 0.424

A nitrogen oxide is 63.65% by mass nitrogen. The molecular formula could be ________.

• NO2
• N2O4
• NO
• N2O

There are ________ mol of carbon atoms in 4 mol of C4H8O2.

• 20
• 16
• 8
• 4

There are ________ hydrogen atoms in 25 molecules of C4H4S2.

• 25
• 6.0 × 1025
• 1.5 × 1025
• 100

What is the empirical formula of a compound that contains 29% Na, 41% S, and 30% O by mass?

• NaSO3
• Na2S2O6
• Na2S2O3
• NaSO

A compound contains 40.0% C, 6.71% H, and 53.29% O by mass. The molecular weight of the compound is 60.05 g/mol. The molecular formula of this compound is ________.

• CH2O
• C2H4O2
• C2H3O4
• C2H2O4