How many grams of oxygen gas would be needed to react with 75 grams of hydrogen gas

To determine the amount of oxygen gas needed to react with hydrogen gas, we need to know the balanced chemical equation for the reaction between hydrogen and oxygen. The balanced equation is as follows:

2 H2 + O2 → 2 H2O

From the equation, we can see that 2 molecules of hydrogen react with 1 molecule of oxygen to produce 2 molecules of water. Now, let's calculate the molar mass of hydrogen and oxygen to help us convert the given mass of hydrogen gas to the required mass of oxygen gas.

The molar mass of hydrogen (H2) is 2 g/mol, while the molar mass of oxygen (O2) is 32 g/mol.

First, let's convert the mass of hydrogen gas to moles using the formula:

moles = mass / molar mass

For hydrogen:
moles of H2 = 75 g / 2 g/mol = 37.5 mol

Since the balanced equation shows that 2 molecules of hydrogen react with 1 molecule of oxygen, the mole ratio is 2:1. So, to determine the moles of oxygen required, we can divide the moles of hydrogen by 2:

moles of O2 = 37.5 mol / 2 = 18.75 mol

Finally, let's convert the moles of oxygen to grams:

mass = moles * molar mass

mass of O2 = 18.75 mol * 32 g/mol = 600 g

Therefore, 600 grams of oxygen gas would be needed to react with 75 grams of hydrogen gas.