Use the coefficients. That's what they tell you.
1.
4.1 mols CH4 x ( 2mols O2/1 mol CH4) = 4.1 x (2/1) = 8.2 mols O2
2,
4.8 mols O2 x (1 mol CO2/2 mols O2) = 4.8 x 1/2 = ?
3. Follow the above. Notice the units. In #1, mols CH4 in numerator cancel mols CH4 in the denominator of the fraction to leave units of mols O2 which is what the question wanted. This method ALWAYS works.
CH4(g) + 2O2(g) = CO2 (g) + 2H2O(g)
One mole of methane (CH4) molecules reacts with two moles of oxygen molecules to form one mole of carbon dioxide molecules and two moles of water molecules.
1. 4.1 moles of methane molecules react with oxygen according to the above reaction. How many moles of oxygen molecules reacted?
2. 4.8 moles of oxygen molecules react with methane according to the above reaction. How many moles of carbon dioxide molecules formed?
3. 5.2 moles of carbon dioxide are formed in the above reaction. How many moles of water formed?
1 answer