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126 Chapter Three Stoichiometry 141. A sample of LSD (n-Iysergic acid diethylamide, C24H3oN30)is added to some table salt (sodium chloride) to form a mixture. Given that a 1.00-g sample of the mixture undergoes combus- tion to produce 1.20 g of CO 2 , what is the mass percent of LSD in the mixture? 142. Methane (CH 4 ) is the main component of marsh gas. Heating methane in the presence of sulfur produces carbon disulfide and hydrogen sulfide as the only products. a. Write the balanced chemical equation for the reaction of methane and sulfur. b. Calculate the theoretical yield of carbon disulfide when 120. g of methane is reacted with an equal mass of sulfur. 143. A potential fuel for rockets is a combination of BsH9 and 02. The two react according to the following balanced equation: 2BsH9(l) + 120 2 (g) ----* 5B 2 0 3 (S) + 9H 2 0(g) If one tank in a rocket holds 126 g BsH9 and another tank holds 192 g 02, what mass of water can be produced when the entire contents of each tank react together? 144. A 0.4230-g sample of impure sodium nitrate was heated, con- verting all the sodium nitrate to 0.2864 g of sodium nitrite and oxygen gas. Determine the percent of sodium nitrate in the orig- inal sample.
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