再来一篇。。无奈啦，难得有东西会让我那么兴致勃勃的==
放心放心，不会很长，短短罢了。。不要吓到啦==原谅我的英文啊~很烂我知道，不过哦，应该没有写错东西咯。。呵呵~
before that we have discuss on density..yea..beside the formula mass/Volume..density have another formula to calculate on^^ i will just follow the text la..easier..haha!!i scare later u all pengsan after read wat i have summarize
rearrange the ideal gas equation, we can calculate the density of a gas :
n/V = P/RT
The number of moles of the gas, n is given by
n = m/M
where m is the mass of the gas in grams and M is the molar mass. therefore
m/MV = P/RT
because density, d, is mass per unit volume, we can write
d = m/V = PM/RT
understand??take time la~haha..it sure benefits u a little when u are talking with future friend who study in chemistry ^^
see?short enough leh?haha~enjoy your day my fellow friend ^^
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