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Mole concept and Stoichiometry — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryMole concept and Stoichiometry3 Marks
Question
Solid ammonium dichromate decomposes as:
$
\left( NH _4\right)_2 Cr _2 O _7 \longrightarrow N _2+ Cr _2 O _3+4 H _2 O
$
If $63 g$ of ammonium dichromate decomposes. Calculate calculate the mass of chromium (III) oxide formed at the same time.
✓

Answer

Solid ammonium dichromate decomposes as:
$
\left( NH _4\right)_2 Cr _2 O _7 \longrightarrow N _2+ Cr _2 O _3+4 H _2 O
$
$252 g$ of ammonium dichromate gives $152 g$ of $CrO _3$
$63 g$ of ammonium dichromate gives $\frac{63 \times 152}{252}$
$
=38 g
$

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