1. According to the Bronsted-Lowry definition, which chemical in the following reaction is the base? H3PO4 + H2O -> H3O+ + H2PO4- (Points : 5)
H2O
H3O+
H3PO4
H2PO4-
None of the above
2.Which is reduced in the following reaction? 2 Bi3+ + 3 Mg -> 2 Bi + 3 Mg2+ (Points : 5)
Mg
Bi
Mg2+
Bi3+
None of the above
3. Which is the pH of a solution with a [H3O+] of 1 × 10-9 M? (Points : 5)
-9.0
5.0
-5.0
9.0
None of the above
4. A sample of helium gas occupies 1,521 mL at 719 mmHg. For a gas sample at constant temperature, determine the volume of helium at 745 mmHg. (Points : 5)
5. A gas at a temperature of 85 degrees C occupies a volume of 175 mL. Assuming constant pressure, determine the volume at 15 degrees C. (Points : 5)
6. For a gas at standard temperature and pressure with a density of 1.75 g/L, determine its molar mass. (Points : 5)
7. Calculate the pressure, in atmospheres, of 3.94 mol CO(g) in a 4.25 L tank at 31 degrees C. (Points : 5)