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?

Answer 1

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

Answer 2

0.256 mol of that stuff

50.45g/mol * 0.256 mol = 12.91g

Answer 3

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

Answer 4

that's cheating :/

Answer 5

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

Answer 6

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