Mole ConceptHard
Question
A sample of clay contains 50% silica and 10% water. The sample is partially dried by which it loses 8 g water. If the percentage of silica in the partially dried clay is 52, then what is the percentage of water in the partially dried clay?
Options
A.2.0%
B.6.4%
C.10.4%
D.2.4%
Solution
$\frac{\text{Mass of silica}}{\text{Mass of all components other than water}} = \text{Constant}$
$\text{Or }\frac{50}{90} = \frac{52}{100 - x} \Rightarrow$Mass per cent of water in partially dried clay, x = 6.4%
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