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Quiz

Lesson 3: Alkynes (Acetylene) and Cyclic Hydrocarbons — Picture questions (exam style)

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1.
The ethyne from 6.4 g of CaC₂ (64% pure) is passed into bromine water. What is the greatest mass of bromine it can react with? (Br = 80)
The ethyne from 6.4 g of CaC₂ (64% pure) is passed into bromine water. What is the greatest mass of bromine it can react with? (Br = 80)
16.0 g
10.2 g
41.0 g
20.5 g
2.
The ethyne from 0.64 g of CaC₂ (75% pure) is converted completely to ethanal. What mass of ethanal forms? (O = 16, H = 1)
The ethyne from 0.64 g of CaC₂ (75% pure) is converted completely to ethanal. What mass of ethanal forms? (O = 16, H = 1)
0.195 g
0.330 g
0.345 g
1.08 g
3.
Starting from 12.8 g of CaC₂ in the sequence shown (yield of each step on its arrow, molar masses in brackets). Which option is correct?
Starting from 12.8 g of CaC₂ in the sequence shown (yield of each step on its arrow, molar masses in brackets). Which option is correct?
mass of CH₃COOH = 6.2 g, overall yield = 48.4%
mass of CH₃COOH = 12 g, overall yield = 48.4%
mass of CH₃COOH = 5.81 g, overall yield = 48.4%
mass of CH₃COOH = 6.84 g, overall yield = 60%
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