Multiple choice #2 for exam 1

Multiple choice #2 for exam 1 - 1 1 Balance the following...

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1 _____ 1. Balance the following combustion reaction and answer the question below. ____C 4 H 10 (g) + ____O 2 (g) ____CO 2 (g) + ____H 2 O(g) The complete combustion of 0.40 moles of butane gas, C 4 H 10 , will: (a) consume 0.40 mol O 2 and produce 0.20 mol CO 2 . (b) consume 0.80 mol O 2 and produce 0.40 mol CO 2 . (c) consume 1.3 mol O 2 and produce 0.80 mol CO 2 . (d) consume 2.6 mol O 2 and produce 1.6 mol CO 2 . (e) consume 5.2 mol O 2 and produce 3.2 mol CO 2 . _____ 2. What mass of carbon reacts completely with 17.8 grams of SiO 2 according to the following equation? SiO 2 (s) + 3 C(s) SiC(s) + 2 CO(g) _____ 3. How many moles of potassium bromide can be produced from the reaction of 2.92 moles of potassium with 1.78 moles of bromine gas? 2 K(s) + Br 2 (g) 2 KBr(s) _____ 4. Under certain conditions the formation of ammonia from nitrogen and hydrogen has a 7.82% yield. Under these conditions, how many grams of NH 3 will be produced from the reaction 25.0 g N 2 with 2.00 g H 2 ? N 2 (g) + 3 H 2 (g) 2 NH 3 (g)
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2 _____ 5. A 4.236-g sample of a hydrocarbon (C x H y ) is combusted in O 2 completely to give 3.810 g of H 2 O and 13.96 g of CO 2 . What is the empirical formula of the hydrocarbon? (a) C 2 H 3 (b) C 3 H 2 (c) C 3 H 4 (d) C 4 H 3 (e) C 5 H 12 _____ 6. If 8.33 g of Ca(NO 3 ) 2 is dissolved in enough water to make 0.250 L of solution, what is the molar concentration of Ca(NO 3 ) 2 ? _____
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