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16 September, 14:52

Sodium metal and water react to form hydrogen and sodium hydroxide. If 5.98 g of sodium react with water to form 0.26 g of hydrogen and 10.40 g of sodium hydroxide, what mass of water was consumed in the reaction

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  1. 16 September, 15:10
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    The mass of water that was consumed in the reaction = 4.68 grams

    Calculation and explanation

    According to the law of mass conservation the mass of the product in a chemical reaction must be equal to mass of product.

    mass of the product = mass of hydrogen + mass of sodium hydroxide

    mass of product=0.26 g + 10.40 = 10.66 grams

    mass of reactant therefore must be = 10.66 grams

    mass of reactant = mass of sodium metal + mass of water

    let mass of H2O be represented by

    10.66 = 5.98 g + Y

    like terms together Y = 10.66 - 5.98 = 4.68 grams of water
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