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Calculate the atomic percent of tungsten in an alloy prepared with 56 grams of tungsten and...

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Chemistry

Calculate the atomic percent of tungsten in an alloy preparedwith 56 grams of tungsten and 48 grams of aluminum. The atomic massof tungsten is 183.85 g/mol and aluminum is 26.98 g/mol.

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3.9 Ratings (409 Votes)

Given mass of aluminium , mAl =48 g

Mass of tungsten , mW = 56 g

Total mass , M = mAl + mW = 48+56 = 104 g

Number of moles of Al , nAl = mAl / atomic mass of Al

                                        = 48 g / 26.98 (g/mol)

                                        = 1.78 mol

Number of moles of W , nW = mW / atomic mass of W

                                        = 56 g / 183.85 (g/mol)

                                        = 0.304 mol

Total number of moles , N = nAl + nW = 1.78+0.304 = 2.084

So atomic percent of tungsten = (nW / N )x100

                                            = (0.304/2.084)x100

                                            = 14.6 %
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