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7 gram of gas occupies a volume of 4.1 litre at 300°K temperature and 1 atmospheric pressure. What will be the molecular mass of gas?

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in Farm Machinery by (38.9k points)
7 gram of gas occupies a volume of 4.1 litre at 300°K temperature and 1 atmospheric pressure. What will be the molecular mass of gas?

(a) 78.19

(b) 42.05

(c) 35.65

(d) 18.19

This question was posed to me during an interview.

This question is from Diesel Engine Vs. Petrol Engine topic in section Internal Combustion Engine of Farm Machinery

1 Answer

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Best answer
Right choice is (b) 42.05

To elaborate: Using the formula

PV=\(\frac{W}{M}\)*R*T

M=\(\frac{WRT}{PV}=\frac{7*0.082*300}{1*4.1}\)=42.05.

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