मराठी

Find the percentage of boron in Na2B4O7.10H2O. [H = 1, B = 11, O = 16, Na = 23]. - Chemistry

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प्रश्न

Find the percentage of boron in Na2B4O7.10H2O. [H = 1, B = 11, O = 16, Na = 23].

संख्यात्मक
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उत्तर

The molecular mass of Na2B4O7.10H2O = 2(Na) + 4(B) + 7(O) + 10[2 + 16]

= 2(23) + 4(11) + 7(16) + 180

= 46 + 44 + 112 + 180

= 382

Percentage of B in (Na2B4O7.10H2O) = `44/382 xx 100`

= 11.5%

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Percentage Composition, Empirical and Molecular Formula
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