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Chemistry, 25.11.2019 21:31 melissarodrigue7
Question 1(multiple choice worth 4 points)
(05.04 mc)
what mass of co is needed to react completely with 55.0 g of fe2o3 in the reaction: fe2o3(s) + co(g) → fe(s) + co2(g)?
4.82 g co
9.64 g co
14.5 g co
28.9 g co
question 2(multiple choice worth 4 points)
(05.04 lc)
which of the following is a valid mole ratio from the balanced equation 2c3h6 + 9o2 → 6co2 + 6h2o?
one mole of c three h six over two moles of c o two
six moles of h two o over nine moles of o two
two moles of c three h six over six moles of o two
three moles of h two o over 2 moles of c o two
question 3(multiple choice worth 4 points)
(05.04 mc)
read the following chemical equation.
fe + o2 → fe2o3
which of the following fractions can be used for the mole ratio to determine the mass of fe from a known mass of fe2o3?
four over two
three over two
two over three
two over four
question 4(multiple choice worth 4 points)
(05.04 mc)
in an experiment, zinc chlorate decomposed according to the following chemical equation.
zn(clo3)2 → zncl2 + o2
(molar mass of zn(clo3)2 = 232.29 g/mol; zncl2 = 136.286 g/mol; o2 = 31.998 g/mol)
if the mass of zinc chlorate was 150 grams, which of the following calculations can be used to determine the mass of oxygen gas formed?
(150 × 1 × 232.29) ÷ (31.998 × 3) grams
(150 × 3 × 232.29) ÷ (31.998 × 1) grams
(150 × 1 × 31.998) ÷ (232.29 × 3) grams
(150 × 3 × 31.998) ÷ (232.29 × 1) grams
question 5(multiple choice worth 4 points)
(05.04 lc)
how many moles of sodium cyanide (nacn) would be needed to produce 4.2 moles of sodium sulfate (na2so4)?
h2so4 + 2nacn → 2hcn + na2so4
2.1 mol nacn
4.2 mol nacn
8.4 mol nacn
12.0 mol nacn
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Answers: 1
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Question 1(multiple choice worth 4 points)
(05.04 mc)
what mass of co is needed t...
(05.04 mc)
what mass of co is needed t...
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