2Al + 6HCl –> 2AlCl3 + 3H2 Aluminium reacts with hydrochloric acid. How many grams of aluminum are necessary to produce 11 L of hydrogen

2Al + 6HCl –> 2AlCl3 + 3H2 Aluminium reacts with hydrochloric acid. How many grams of aluminum are necessary to produce 11 L of hydrogen gas at STP? ( 8.8 g )

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  1. Answer:

    8.8g of Al are necessaries

    Explanation:

    Based on the reaction, 2 moles of Al are required to produce 3 moles of hydrogen gas.

    To solve this question we must find the moles of H2 in 11L at STP using PV = nRT. With these moles we can find the moles of Al required and its mass as follows:

    Moles H2:

    PV = nRT; PV/RT = n

    Where P is pressure = 1atm at STP; V is volume = 11L; R is gas constant = 0.082atmL/molK and T is absolute temperature = 273.15K at STP

    Replacing:

    1atm*11L/0.082atmL/molK*273.15K = n

    n = 0.491 moles of H2 must be produced

    Moles Al:

    0.491 moles of H2 * (2mol Al / 3mol H2) = 0.327moles of Al are required

    Mass Al -Molar mass: 26.98g/mol-:

    0.327moles of Al * (26.98g / mol) = 8.8g of Al are necessaries

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