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xeze [42]
3 years ago
14

What is the total mass of oxygen contained in 8.20g of benzoic acid (C6H5COOH)

Chemistry
1 answer:
VashaNatasha [74]3 years ago
4 0

Answer:

Mass of oxygen = 2.2 g

Explanation:

Given data:

Mass of benzoic acid= 8.20 g

Mass of oxygen= ?

Solution:

Molar mass of oxygen = 16×2 g/mol

Molar mass of C₆H₅COOH = 7×12 + 1×6 + 2×16

Molar mass of C₆H₅COOH = 84 + 6 + 32

Molar mass of C₆H₅COOH = 122g/mol

Mass of oxygen in 8.20 g of C₆H₅COOH :

Mass of oxygen = 32 g.mol⁻¹/122 g.mol⁻¹ × 8.20 g

Mass of oxygen = 2.2g

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What is the mass of sodium (Na) in 50 grams of table salt (NaCl)? Show your work.
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Answer:

19 g

Explanation:

Data Given:

Sodium Chloride (table salt) = 50 g

Amount of sodium (Na) = ?

Solution:

Molecular weight calculation:

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calculate the mole percent composition of sodium (Na) in sodium Chloride.

Since the percentage of compound is 100

So,

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So,

for the 50 grams of table salt (NaCl) the mass of Na will be

mass of sodium (Na) = 0.393 x 50 g

mass of sodium (Na) = 19 g

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