hydrogen and oxygen combine in the ratio of 1:8 by mass to form water.what mass of oxygen gas would be required to react completely with 3grams of hydrogen gas?

To find the mass of oxygen gas required to react completely with 3 grams of hydrogen gas, we need to use the given ratio of 1:8 by mass for hydrogen and oxygen in water.

Step 1: Determine the mass of oxygen gas required.
Since the ratio of hydrogen to oxygen in water is 1:8 by mass, we can set up a proportion:

(3 grams of hydrogen) / (x grams of oxygen) = (1 gram of hydrogen) / (8 grams of oxygen)

To solve for x (the mass of oxygen gas):

Cross-multiply and divide:
3 * 8 = 1 * x

24 = x

Hence, 24 grams of oxygen gas would be required to react completely with 3 grams of hydrogen gas.