Answer:
0.06457g of H₂
Explanation:
2Al(s) + 6H₂O(l) + 2KOH(aq) → 2K[Al(OH)₄](aq) + 3H₂(g)
Based on the equation 2 moles of Al produce 3 moles of hydrogen.
First, we need to convert mass of Al to moles and then with the chemical equation find moles and mass of hydrogen:
Moles Al (Molar mass: 26.982g/mol):
1.15g Al * (1mol / 26.982g) = 0.04262 moles Al
Moles H₂:
0.04262 moles Al * (3 moles H₂ / 2 mol Al) = 0.06393 moles H₂
Mass hydrogen (Molar mass: 1.01g/mol):
0.06393 moles H₂ * (1.01g/mol) =
0.06457g of H₂
