The mass of 800cm3 of a gas X at s.t.p. is 1.0g. What is the molar mass of X? [1 mole of a gas at s.t.p occupies 22.4dm 3]
Question 1 Report
The mass of 800cm3 of a gas X at s.t.p. is 1.0g. What is the molar mass of X? [1 mole of a gas at s.t.p occupies 22.4dm 3]
Answer Details
The molar mass of gas X can be determined by using the formula: molar mass = mass / (volume of gas at stp / molar volume of gas at stp) The mass of the gas X is given as 1.0g and the volume of 800cm3 can be converted to dm3 by dividing by 1000: volume of gas at stp = 800cm3 / 1000 = 0.8dm3 The molar volume of a gas at stp is given as 22.4dm3/mol. Substituting these values into the formula, we get: molar mass = 1.0g / (0.8dm3 / 22.4dm3/mol) molar mass = 1.0g / (0.0357mol) molar mass = 28.0g/mol Therefore, the molar mass of gas X is 28.0g/mol. The correct option is: 28.0gmol-1.
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