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Mm CH4 = 16 g/mol
moles ( n) = masa / Mm
n = 100 g / 16 g /mol = 6.25 moles
B)
Mm H2O = 18 g/mol
moles ( n) = masa / Mm
n = 200 g / 18 g /mol = 11.111 moles
C)
Mm HCl = 36.46 g/mol
moles ( n) = masa / Mm
n = 70 g / 36.46 g /mol = 1.9199 moles
d)
Mm SO2 = 64 g/mol
moles ( n) = masa / Mm
n = 90 g / 64 g /mol = 1.4063 moles