Question

102. Chalk contains 10% calcium, 3% carbon and 12% oxygen. Find the
amount of carbon and calcium (in grams) in 2 1/2 kg of chalk.​

Answer 1

Step-by-step explanation:

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$\Longrightarrow$ Amount of calcium = 250grams.

$\Longrightarrow$ Amount of carbon = 75grams.

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${In\ chalk}$

$\Longrightarrow$ $Calcium=10%$

$\Longrightarrow$ $Carbon=3%$

$\Longrightarrow$ $Oxygen=12%$

$\Longrightarrow$ Remaining = 100 - (10 + 3 + 12) = 100 - 25 = 75%

$\Longrightarrow$ Weight of chalk = ${2\frac{1}{2}}$ = $\frac{5}{2}$kg.

$\Longrightarrow$ Amount of carbon = $\frac{5}{2}$ × $\frac{3}{100}$ = $\frac{3}{40}$kg.

= $\frac{3}{40}×{1000}$ = 75grams.

$\Longrightarrow$ Amount of calcium = $\frac{5}{2}$ × $\frac{10}{100}$ = $\frac{1}{4}$kg

= 250grams.

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