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Subject Test Chemistry

Question 5 of 17

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SAT Subject Test

Each of the questions or incomplete statements below is followed by five suggested answers or completions.  Select the one that is best in each case.

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The combustion of propane, text C end text text end text subscript 3 end subscript text H end text text end text subscript 8 end subscript left parenthesis g right parenthesis, proceeds according to the equation above. How many grams of water will be formed in the complete combustion of 44.0 grams of propane?

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4.50 text g end text

Correct Answer: 
No

18.0 text g end text

Correct Answer: 
No

44.0 text g end text

Correct Answer: 
No

72.0 text g end text

Correct Answer: 
Yes

176 text g end text

Correct Answer: 
No

The molar mass of text C end text text end text subscript 3 end subscript text H end text text end text subscript 8 end subscript left parenthesis g right parenthesis is 44.0 text  g/mol end text. According to the equation, four moles of water are formed for each mole of propane combusted. The molar mass of water is 18.0 text  g/mol end text, so the mass of water formed is 18.0 text g end text cross times 4 equals 72.0 text g end text.

Question Difficulty: 
easy