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Mole Concept And Stoichiometry — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryMole Concept And Stoichiometry3 Marks
Question
Water can split into hydrogen and oxygen under suitable conditions. The equations representing the change is:
$2H_2O(I) \rightarrow 2H_2 (g) + O_2(g)$
Ammonia burns in oxygen and the combustion in the presence of a catalyst may be represented as:
$2NH_3 (g) +2^{1/2}O_2 (g) \rightarrow 2NO (g) + 3H_2O (I)$
What mass of steam is produced when $1.5 g$ of nitrogen monoxide is formed?
✓

Answer

Given equation is:
$2NH_3 (g) +2^{1/2}O_2 (g) \rightarrow 2NO (g) + 3H_2O (I)$
Molecular mass of $NO = 30$
Molecular mass of $H_2O = 18$
From the equation :
$2 \ moles$ of $NO = 3 \ moles$ of $H_2O$
$60g$ of $NO = 54g$ of $H_2O.$
$1.5g$ of $NO = 54 \times 1.5 / 60 = 1.35g$ of $H_2O.$

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