1.2 grams of magnesium were added to 100 mL of 0.1 M HCl solution. Calculate the volume of hydrogen gas produced at STP.
Correct answer: D. 0.112 L.
- A. 0.8 L.
- B. 0.5 L.
- C. 0.4 L.
- D. 0.112 L.
Explanation
The working for the above question is as follows:We know that the volume of 1 mole of any gas at STP is 22.4 L. This is known as Avogadro's Law. Therefore, to calculate the volume of hydrogen gas produced at STP, we can multiply the number of moles of hydrogen gas produced by 22.4 L/mol.We calculated that 0.049 mol of hydrogen gas is produced in this case. Therefore, the volume of hydrogen gas produced at STP is:0.049 mol * 22.4 L/mol = 0.112 L.
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Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
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