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25-01-2019
Chemistry

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Type the correct answer in the box. Tungsten carbide is becoming popular for making jewelry. A chemist is examining a sample of tungsten carbide (chemical formula WC). What is the percent composition of tungsten in this compound? Round your answer to the nearest whole percent. The percent composition of tungsten is what %?

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Dejanras Dejanras

11-02-2019

The answer is: the percent composition of tungsten in this compound is 94%.

Mr(WC) = Ar(W) + Ar(C).

Mr(WC) = 183.85 + 12.01.

Mr(WC) = 195.86; molecular mass of tungsten carbide.

ω(W) = Ar(W) ÷ Mr(WC) · 100%.

ω(W) = 183.85 ÷ 195.86 · 100%.

ω(W) = 93.87%; mass percent of tungsten in a sample.

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RomeliaThurston RomeliaThurston

11-02-2019

Answer: The percent composition of tungsten in tungsten carbide is 94%.

Explanation:

Percent composition of an element in a compound is defined as the mass of the element present in 1 mole of a compound.

Mass of 1 mole of WC = 196 g/mol

Mass of tungsten = 184 g/mol

The percent composition of tungsten in WC = [tex]\frac{184}{196}\times 100 = 93.87\%[/tex]

Rounding this off to the nearest whole percent, we get:

[tex]93.87\%\approx 94\%[/tex]

Hence, the percent composition of tungsten in tungsten carbide is 94%.

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