Question

calculate the relative molecular mass of (NH4)2Cr2O7

Answer 1

14.0067 + 1.00794*4)*2 + 51.9961*2 + 15.9994*7=252.06492 g/mol

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Answer 2

mass of chromium is equals to 52 grams
mass of hydrogen is equal to 1 gram
mass of Nitrogen equals to 14 grams
and mass of oxygen equal to 16 grams
we have ammonium dichromate that is
(NH4)2cr2 O7 formula for Molecular mass is equal to mass of Nitrogen into 2 + mass of hydrogen into 8 + mass of chromium into 2 + mass of oxygen into 7
14 x 2 + 1 x 8 + 52 x 2 + 16 x 7
=> 28+8+104+112=252
that totals up to 252 grams
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