What is the mass of a millimole of methane (CH4) in milligramme's?
Answers:
1 x Carbon = 12.01
4 x Hydrogen = 4 x 1.008 = 4.032
1 mole = 16.042 g
1 millimole = 16.042 mg
number of mole = mass of the molecule / molar mass of the molecule
a millimole = 10^-3
thus, 10^-3 = mass / (12+4)
then just calculate as normal. the mass is in grams!btw
so, just multiply the answer by 1000 to get milligrams
16.05 milligrams
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