Question

Calculate the mass ℅ composition of copper pyrites (CuFeS2).​

Answer 1

Q. Calculate the mass ℅ composition of copper pyrites (CuFeS2).

Ans:-

Mass percentage of copper= 34.64%

Mass percentage of Iron = 30.44%

Mass percentage of sulphur = 34.91%

Explanation:-

Molar mass of CuFeS2

= 63.5 + 55.8 + 2 × 32 = 183.3

$mass \: \% \: of \: an \: element \: = \frac{mass \: of \: that \: element \: in \: one \: mole}{molar \: mass \: of \: compound}$

$mass \: of \: cu \: = 63.5$

$mass\% \: of \: cu \: = \frac{63.5}{183.3} \times 100$

$= 34.64\%$

$mass \: of \: iron \: = 55.8$

$mass \: \% \: of \: iron \: = \frac{55.8}{183.3} \times 100$

$= 30.44\%$

$mass \: of \: sulphur \: = 2 \times 32 = 64$

$mass \: \% \: of \: sulphur \: = \frac{64}{183.3} \times 100$

$34.91\%$

Answer 2

Explanation:

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