5. The average distance from the sun to Earth is 9.3 X 10⁷ miles. How many kilometers is this? (1 mile= 1.61 km)
a. 1.5 X 10⁸ km
b. 1.5 X 10⁵ km
c. 5.6 X 10⁷ km
d. 1.7 X 10¯⁸km
e. 1.5 X 10¹¹ km

6. A metal piece has a mass of 101 g and a volume of 31 cm³. What is the density of the metal?
a. 3.00 g/mL
b. 3.26 g/mL
c. 2.23 g/mL
d. 1.51 g/mL
e. 0.31 g/mL

11. How many atoms of nitrogen are in 4 moles of (NH4)3 PO4?
a.2.41 x 10²⁴
b.7.23 x 10²⁴
c.12.0 x 10²³
d.16.3 x 10²³
e.48.2 x 10²⁴

12.How many moles of NH3 are there in 77.5g of NH3?
a.0.220 mol
b.4.56 mol
c.14.0 mol
d.1.31 X 10³ mol
e.7.75

13. Calculate the molecular mass of potassium sulfate, K2SO4.
a.87 amu
b.126 amu
c.135 amu
d.174 amu
e.187 amu

14. When the following chemical equation is balanced, what is the order of coefficients 14. for the reactants and products in simplified form?
_____ Al4C3 + ______ H2O ----> ______ Al(OH)3 + ____ CH4
a. 2,24,8,6
b. 1,6,4,3
c. 1,12,4,3
d. 2,12,4,3
e. 1,12,3,3

15. How many moles of H2O are produced if 7.65 moles of ammonia react with excess oxygen according to the following balanced equation?
4 NH3 +502 ----> 4NO + 6 H2O
a. 4
b. 6
c. 11.5
d. 5.1
e. 7.65

16. Consider the following reaction: 2C4H10 + 13 O2 ----> 8 CO2 + 10 H2O
How much of water will be produced in the reaction if 32 g of CaH10 react with excess amount of oxygen?
a. 32 g
b 41 g
c. 15.9 g
d. 49.6 g
e. 17.7 g

19. Which of the following is a weak electrolyte in aqueous solution?
a. H2SO3
b. HNO3
c. HBr
d. HCIO4
e. NaOH

20. A solution of 40 ml of 2M HCI is diluted to 100 ml. What is the resulting concentration of the solution?
a. 2M
b. 1 M
C. 1.5 M
d. 0.6 M
e. 0.8 M

22. A sample of methane, CH4, occupies a volume of 275mL and exerts a pressure of 872mmHg. If the volume of the gas is allowed to expand to 785mL, what will be the pressure of the gas?
a. 284 mmHg
b. 305 mmHg
c. 421 mmHg
d. 842 mmHg
e. 2490 mmHg

24. If ΔH = +23 kJ for a certain process, that process
a. occurs slowly.
b. is exothermic.
C. is endothermic.
d. is nonspontaneous.
e. is spontaneous.

25. How much heat is lost when 250 g of iron is cooled from 45.2 to 34.5°C?
Note: The specific heat of iron is 0.444 J/g - .°C
a. 1188
b. 2000
c. 4995
d. 3830
e. 8847

32. lonic bonds are characterized by
a. presence of nonmetals only
b. a. sharing of electrons
c. weak strength
d. multiple bonds
e. the exchange of electrons

33. The compound CH3CH2OH would contain which of the following intermolecular forces of attraction?
a. London dispersion forces
b. Hydrogen Bond
c. Dipole-Dipole
d. London forces and Dipole-Dipole
e. All of the above

34. Which of the following compounds would possess the LOWEST boiling point?
a. CH3CH2OH
b. CH3OH
C. HCI
d. C6H6
e. HF

35. Solids are characterized by
a. low melting point
b. low density
C. tightly packed molecules
d. high degree of molecular spacing
e. variable volume

5. The average distance from the sun to Earth is 9.3 X 10⁷ miles. H...