Question

Many metals react with acids to produce hydrogen gas. A certain reaction produces 32.6 L of hydrogen gas at STP. How many moles of hydrogen were produced? *

22.4 mol

1.46 mol

730 mol

16.3 mol

Answer 1

1.46 mol of H₂

Step-by-step explanation:

This easy question can be solved by a rule of three.

At STP conditions, we know that 1 mol of any gas is contained in 22.4L.

So let's make the operation:

22.4L is the volume for 1 mol of any gas, at STP

32.6 L may be the volume for (32.6 . 1) /22.4 = 1.46 moles.

We can also apply, the Ideal Gases Law.

At STP conditions, Temperature is 273.15 K and pressure is 1 atm

P . V = n . R . T

n = (P . V) / R. T → (1 atm . 32.6L) / (0.082 . 273.15K)

n = 1.455 mol