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What is the molecular mass of an unknown gas if 6.5 liters at 75C and 700...

What is the molecular mass of an unknown gas if 6.5 liters at 75C and 700 mm pressure weigh 30.0 grams?

a. 143 g/mol

b. 121.3 g/mol

c. 87.4 g/mol

d. 54.8 g/mol

e. 30.8 g/mol

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