What is the molar mass of ammonium dichromate, (NH 4 ) 2 Cr 2 O 7 ?

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What is the molar mass of ammonium dichromate, (NH4)2Cr2O7?

(a) 238.09 g/mol

(b) 252.10 g/mol

(c) 260.18 g/mol

(d) 372.18 g/mol

(e) 386.19 g/mol.

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