Chemistry, Help!

a) A 750-mL sample of hydrogen exerts a pressure of 822 torr at 325 K. What pressure does it exert if the temperature is raised to 475 K at constant volume?

b) Aluminum oxide, Al2O3, is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators. Calculate the number of moles in 47.51 g of Al2O3.

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  1. 1.
    (P1V1/T1) = (P2V2/T2)

    2.
    mols = grams/molar mass

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  2. Answer: 1.20 x 10^3

    Explanation: 822/325 = ?/475

    Isolate the unknown by multiplying both sides by 475/1 (reciprocal). So you divided 822 by 325 and get 2.529230769. You take that and multiply it by 475 and get 1201, which equals1.20 x 10^3.

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