Which of the following is equal to 0.500 mol?
A. 32.0 g O(2)
B. 103.6 g Pb
C. 36.0 g H(2)O
D. 14.0 g CO(2)
help please

B

Explanation:

Think about the molar masses of each.

O2 -> 32 g

So 32 g = 1 mol.

Pb -> 207.2 g

So 103.6 g = .5 mol!

H2O -> 18 g

So 36 g = 2 mol.

CO2 -> 44 g

So 14 g = .3 mol

1.43 x 10^-11 j the guy commented the awnser just making sure u see it .

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.