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for which compound does 0.256 mole weigh 12.8 g?

A) \(C_2 H_4 O\)
B) \(CO_2\)
C) \(CH_3 Cl\) <--answer
D) \(C_2 H_6\)
E) None of these

can someone tell me why C is the right answer and not E?,

Respuesta :

ChemistryHelper2024
Number of moles = [tex] \frac{mass (g)}{Molar mass} [/tex]
so to calculate molar mass (Molecular weight of compound):
Molecular weight = [tex] \frac{mass (g)}{number of moles} [/tex]
            = [tex] \frac{12.8 g}{0.256 mole} [/tex] = 50 g / mole
Now we calculate molecular weight of each compound in choices:
a) C₂H₄O = 44
b) CO₂ = 44
c) CH₃Cl = 50.4 ALMOST 50  so this is the correct answer
d) C₂H₆ = 30

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