for which compound does 0.256 mole weigh 12.8 g?

A) $C_2 H_4 O$
B) $CO_2$
C) $CH_3 Cl$

Question

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?

anonymous · Answer

C weights 12g/mole
H weights 1g/mole
Cl weights 35.45g/mole

12g/mole + (3*1g/mole)+35.45g/mole = 50.45g/mole

So, CH3Cl weights 50.45g/mole

zepp · Answer

0.256 mol of that stuff

50.45g/mol * 0.256 mol = 12.91g

anonymous · Answer

They probably round everything to the whole so
C weights 12g/mole
H weights 1g/mole 
Cl weights 35.45g/mole $\approx$ 35g/mole

12+3+35=50

50g/mol * 0.256mol = 12.8g

lgbasallote · Answer

that's cheating :/

lgbasallote · Answer

i should have been right >.< it should be none of those

zepp · Answer

My second me is better that the real me? :(