chemistry

for a given substance what information links mass to moles? number of particles

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  1. moles = grams/molar mass
    There are 6.022 x 10^23 molecules (particles) in a mole.

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  2. Use the equation below to answer the questions
    that follow.
    Br2 + Cl 2 → 2BrCl
    a. How many moles of BrCl form when
    2.74 mol Cl2 react with excess Br2?
    b. How many grams of BrCl form when
    239.7 g Cl2 react with excess Br2?
    c. How many grams of Br2 are needed to
    react with 4.53 × 1025 molecules Cl2?

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