A 31.0 L sample of acetylene, C2H2( g), at STP is subject to a new temperature and pressure of 35.0°C and 805?

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A 31.0 L sample of acetylene, C2H2( g), at STP is subject to a new temperature and pressure of 35.0°C and 805?

A 31.0 L sample of acetylene, C2H2( g), at STP is subject to a new temperature and pressure of 35.0°C and 805 mmHg. Calculate the volume of the acetylene under these new conditions.

a.33.0L

b. 33.02L

c. 25.94L

d.25.9L

Science & Mathematics / Chemistry

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pisgahchemist

Verified answer

P1V1 / T1 = P2V2 / T2

V2 = P1V1T2 / T1P2

V2 = 760 torr x 31.0L x 308K / 273K / 805 torr

V2 = 33.0 L

With choices (a) and (b) the question author is checking to see if you realize how many significant digits must be in the answer. The result must be expressed to 3 significant digits, and so the answer is (a).

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