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26 June, 07:53

Zinc metal reacts with hydrochloric acid to produce zinc (II) chloride and hydrogen gas. How many liters of hydrogen gas will be produced at STP when 10.00 g of zinc metal is added to 23.8 mL of a 0.45 M hydrochloric acid solution?

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  1. 26 June, 09:45
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    0.120 L of hydrogen gas will be produced

    Explanation:

    Step 1: Data given

    Mass of zinc = 10.0 grams

    Volume of hydrochloric acid = 23.8 mL

    Molarity of hydrochloric acid = 0.45 M

    Molar mass of zinc = 65.38 g/mol

    Step 2: The balanced equation

    Zn + 2HCl → ZnCl2 + H2

    Step 3: Calculate moles Zinc

    Moles Zn = mass Zn / molar mass Zn

    Moles Zn = 10.0 grams / 65.38 g/mol

    Moles Zn = 0.153 moles

    Step 4: Calculate moles HCl

    Moles HCl = molarity * volume

    Moles HCl = 0.45 M * 0.0238 L

    Moles HCl = 0.01071 moles

    Step 5: Calculate limiting reactant

    For 1 mol Zn, we need 2 moles HCl to produce 1 mol ZnCl2 and 1 mol H2

    HCl is the limiting reactant. It will completely be consumed (0.01071 moles)

    Zn is in excess. There will react 0.01071/2 = 0.005355 moles

    There will remain 0.153 - 0.005355 = 0.147645 moles

    Step 6: Calculate moles H2

    For 1 mol Zn, we need 2 moles HCl to produce 1 mol ZnCl2 and 1 mol H2

    For 0.01071 moles HCl we'll have 0.005355 moles H2

    Step 7: Calculate volume H2

    1 mol at STP = 22.4 L

    0.005355 moles = 22.4 * 0.005355 = 0.120 L = 120 mL

    0.120 L of hydrogen gas will be produced
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