How many moles of H2 molecules are there in 0.40 g of H_2? The atomic mass of a single hydrogen atom is 1.0 u.
A. 0.20 moles.
B. 0.40 moles.
C. 4.0 moles.
D. 5.0 moles.
Answer:A
How many moles of H2 molecules are there in 0.40 g of H_2? The atomic mass of a single hydrogen atom is 1.0 u.
A. 0.20 moles. B. 0.40 moles. C. 4.0 moles. D. 5.0 moles.