# Simple Mole Conversions

by jacksonpeeble
Tags: conversion, gas, mass, mole, stp
 PF Gold P: 122 What is the mass of methane (CH4) if it occupies 32.3 L at STP? We got a whole bunch of these problems on a worksheet with minimal instruction. If somebody could please aid me in solving this one, then I should be able to solve the rest. I assume that I must first find the masses of the individual components... C = 12.0107 * 1 = 12.0107 +H = 1.00794 * 4 = 4.03176 --------------------------- 16.0483 Then I honestly don't know what to do... I don't want the answer; I'd just really appreciate if somebody could show me how to do this. I tried searching for a guide online, but none of them really had what I was looking for. Thank you!
 HW Helper PF Gold P: 2,823 STP means Standard Temperature and Pressure. Use PV=nRT.
P: 23,585
 Quote by symbolipoint STP means Standard Temperature and Pressure.
Which - sadly - doesn't mean anything.

jacksonpeeble: you have to know what temperature and pressure your teacher want's you to use as STP, as this thing is not precisly defined.

 PF Gold P: 122 Simple Mole Conversions 1 mole = 22.4 L at STP according to my teacher. What do I do with that equation? I assume that it is the same as (Pressure x Volume)/(Temperature x Moles) = R, but how is this applied? Thanks for the help so far, though!
 P: 5 and then let 32.3 L = x mol at STP. you can get x. do you know how to do now? (forget that equation...for this problem, it is useless.)