Question

A partially dried clay mineral contains 8% water.The original sample contained 12% water and 45% silica.The % of silica in the partially dried sample in nearly :
(a) 50% (b) 49% (c) 55% (d) 47%

Answer 1

(d) 47%

Explanation:

Let the sample be 100 g

Original sample: 12 g of water and 45 g of silica

Dried sample : 8 g of water and x g of silica.. Total weight of dried sample becomes =96 g now

Percentage of silica in dried sample = (45/96)*100 =46.87 %

approximately 47 % of silica is present in partially dried sample

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