Iron reacts with chlorine to form iron(iii)chloride.
A)How many chlorines react with 1.86g of iron?
B)What mass of iron(iii)chloride is produced?

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  1. Write and balance the equation.
    2Fe + 3Cl2 ==> 2FeCl3

    Do you mean "How many mols Cl2 react with 1.86 g Fe?"
    mols Fe = grams Fe/atomic mass Fe = approximately 0.03 but you need to be more accurate than that.

    Using the coefficients in the balanced equation, convert mols Fe to mols Cl2.
    That's 0.03 mols Fe x (3 mols Cl2/2 mol Fe) = approximately 0.03 x (3/2) = about 0.05 mols.

    Convert mols Fe to mols FeCl3. That's
    about 0.03 x (2 mol FeCl3/2 mol Fe) = about 0.03 x 2/2 = about 0.03 mols FeCl3.
    Convert that to grams. g = mols x molar mass.

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