What is the molar mass of (NH4)2Cr207 (Ammonium dichromate)?

1 Answer
Dec 2, 2015

Answer:

The molar mass of ammonium dichromate is #"252.06 g/mol"#

Explanation:

To calculate the molar mass of a compound, you multiply the subscripts of each element times its molar mass (atomic weight in g/mol).

#"(NH"_4)_2"Cr"_2"O"_7"#

When there is no written subscript, it is understood to be #1#. Also, when elements are enclosed in parentheses, the subscripts on the inside are multiplied by the number outside the parentheses.

Molar Masses of the Elements
Nitogen: #"14.007 g/mol"#
Hydrogen: #"1.00794 g/mol"#
Chromium: #"51.9961 g/mol"#
Oxygen: #"15.999 g/mol"#

Molar Mass of Ammonium Dichromate
#(2xx14.007)+(8xx1.00794)+(2xx51.9961)+(7xx15.999)="252.06 g/mol"#