Chemistry Hydrocarbon molecular weight grade 11

AI Thread Summary
To find the molecular weight of a hydrocarbon, the ideal gas law equation PV=nRT is used, where P is pressure, V is volume, n is moles, R is the gas constant, and T is temperature. The mass of the hydrocarbon is given as 0.185g, and the volume is 110 cm³ at 26°C and 743 mmHg. To calculate the moles (n), the equation can be rearranged to n = PV/RT, requiring conversion of all values to appropriate units. Once moles are determined, the molecular weight can be calculated by dividing the mass by the number of moles. This approach effectively leads to the solution for the molecular weight of the compound.
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Homework Statement



A gaseous hydrocarbon weighing 0.185g occupies a volume of 110.cm^3 at 26 celsius and 743mmHg. what is the molecular weight of this compound?

Homework Equations



PV=nRT

The Attempt at a Solution



i have no idea where to start ;(
 
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The molecular weight is in g/mol; you have the mass of the sample, so now you need to find the moles so you can divide them. Rewriting the equation to get n, or the moles, by itself gives you n = PV/RT. Convert everything to the correct units, then plug them into the equation.
 
ohh, i see it now.. many thanks =]
 

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