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d. 0.716 kg<br />
e. 5.85 lb<br />
____ 50. What mass of fluoristan, SnF2, would contain the same mass of tin as 306 grams of cassiterite, SnO2?<br />
a. 295 g<br />
b. 318 g<br />
c. 278 g<br />
d. 367 g<br />
e. 335 g<br />
____ 51. Heating MgSO4•7H2O at 150 C produces MgSO4•xH2O. If heating 24.4 g of pure MgSO4•7H2O at 150 C<br />
were to give 13.7 g of pure MgSO4•xH2O, calculate the value for x.<br />
a. 5<br />
b. 4<br />
c. 3<br />
d. 2<br />
e. 1<br />
____ 52. An ore of lead is 45.0% pure lead sulfide, PbS, and 55.0% impurities in which no other lead compounds are<br />
present. What mass of lead is contained in 150.0 grams of this ore?<br />
a. 71.4 g<br />
b. 67.5 g<br />
c. 58.5 g<br />
d. 9.05 g<br />
e. 18.0 g<br />
____ 53. A dolomite ore contains 40.0% pure MgCO3•CaCO3. No other compounds of magnesium or calcium are<br />
present in the ore. What mass of magnesium and what mass calcium are contained in 100.0 grams of this ore?<br />
a. 18.3 g Mg - 21.7 g Ca<br />
b. 7.91 g Mg - 13.0 g Ca<br />
c. 8.70 g Mg - 31.3 g Ca<br />
d. 5.27 g Mg - 8.69 g Ca<br />
e. 34.5 g Mg - 5.30 g Ca<br />
____ 54. Balancing a chemical equation so that it obeys the law of conservation of matter requires:<br />
a. Adjusting the coefficients in front of the formulas so there are the same number and type<br />
of atom on both sides of the equation.<br />
b. Making sure the reactants and products are in the same phase.<br />
c. Keeping the total charge the same on both sides of the equation.<br />
d. Changing the formulas of the products and reactants.<br />
e. Keeping the same number of molecules on both sides of the equation.<br />
____ 55. Balance the following equation with the smallest whole number coefficients. What is the coefficient for O2<br />
in the balanced equation?<br />
C4H10 + O2 CO2 + H2O<br />
a. 9<br />
b. 5<br />
c. 15<br />
d. 6<br />
e. 13
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