Question

moles of hydrogen in 9.15×10−2 mol C4H10

Answer 1

From the given formula, one mole of C4H10 contains 10 moles of hydrogen.

To know the number of moles of hydrogen in 9.15x10^-2, we will just do a cross multiplication as follows:
number of moles of hydrogen = (9.15 x 10^-2 x 10) / 1 = 0.915 moles