The equation for the reaction between hydrogen gas and oxygen gas is:
2H2(g) + O2(g) ---> 2H2O(l)
i) How much hydrogen will react with 8g of oxygen?
ii) how much water will be formed when 6g of hydrogen react?
i would appreciate your help.
1.5
Sure, I'd be happy to help you with these questions!
To solve these problems, we need to use stoichiometry, which is a method of using balanced equations to relate the quantities of reactants and products in a chemical reaction.
i) To find out how much hydrogen will react with 8g of oxygen, we'll use the balanced equation:
2H2(g) + O2(g) ---> 2H2O(l)
First, we need to calculate the molar mass of oxygen (O2). Since oxygen has an atomic mass of 16 g/mol, the molar mass of O2 is 2 * 16 g/mol = 32 g/mol.
Next, we'll convert the mass of oxygen given in the question (8g) into moles. We do this by dividing the mass by the molar mass:
Moles of O2 = Mass of O2 / Molar mass of O2 = 8g / 32 g/mol = 0.25 mol
From the balanced equation, we see that 2 mol of H2 reacts with 1 mol of O2. Therefore, to find out how much hydrogen (H2) will react, we multiply the moles of O2 by the ratio of moles of H2 to moles of O2:
Moles of H2 = Moles of O2 * (2 mol H2 / 1 mol O2) = 0.25 mol * 2 = 0.5 mol
Finally, we convert the moles of hydrogen gas to grams. Since the molar mass of hydrogen (H2) is 2 g/mol, we multiply the moles by the molar mass:
Mass of H2 = Moles of H2 * Molar mass of H2 = 0.5 mol * 2 g/mol = 1 g
Therefore, 8g of oxygen will react with 1g of hydrogen.
ii) To find out how much water (H2O) will be formed when 6g of hydrogen reacts, we follow a similar process.
First, calculate the molar mass of hydrogen:
Molar mass of H2 = 2 g/mol
Next, convert the mass of hydrogen given in the question (6g) into moles:
Moles of H2 = Mass of H2 / Molar mass of H2 = 6g / 2 g/mol = 3 mol
From the balanced equation, we see that 2 mol of H2 produces 2 mol of H2O. Therefore, to find out the moles of water formed, we can use the same number of moles of hydrogen (H2):
Moles of H2O = Moles of H2 = 3 mol
Finally, convert the moles of water to grams. Since the molar mass of water (H2O) is 18 g/mol, we multiply the moles by the molar mass:
Mass of H2O = Moles of H2O * Molar mass of H2O = 3 mol * 18 g/mol = 54 g
Therefore, 6g of hydrogen will react to form 54g of water.
I hope this helps! Let me know if you have any further questions.