I cant help unless there is an article..
The SI unit for the amount of substance present is the mole.
The mole is defined as the amount of substance that has the same amount of particles as there are atoms in 12 grams of carbon-12. Mathematically, the moles of a substance may be computed using:
moles present = mass of substance / molecular mass of substance
We know that when calculating percent yield, we use the equation:

Since the quantities that we are given in the question are equal, we can just directly divide them to find percent yield:

So now we know that the percent yield of the synthesis is 87.27%.
Answer:
2.04 mol
Explanation:
At STP, 1 mole = 22.4 L
45.6 L of H2 * (1 mole of H2 / 22.4 L ) = 2.04 mol