chemistry

I need help getting this started. I made it through organic and this one stumps me, go figure :)

How many grams fo NaCl are needed to make 100mL of a 0.10M solution?

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asked by AMY
  1. M = mols/L
    mols = g/molar mass.

    eqn 1.
    M = mols/L (The definition of molarity is all you need to remember for this.)
    0.10 M x 0.100 L = 0.010 mols

    eqn 2.
    mols = g/molar mass
    g = mols x molar mass
    g = 0.010 mols x molar mass NaCl = ??

    You can put eqn 1 and 2 together to give
    mols = M x L
    mols = g/molar mass
    set mols = mols
    M x L = g/molar mass and
    M x L x molar mass = g.

    Check my work. Check my arithmetic.

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    posted by DrBob222

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