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chubhunter [2.5K]
3 years ago
13

How many moles are there in 990 grams of sugar, C12H22011? (Sig Figs, do not

Chemistry
1 answer:
Nitella [24]3 years ago
6 0

Answer:

Number of moles = 2.89 mol

Explanation:

Given data:

Number of moles of sugar  = ?

Mass of sugar = 990 g

Solution:

Formula:

Number of moles = mass/molar mass

Molar mass of C₁₂H₂₂O₁₁:

12× 12 + 22×1.008 + 16×11 = 342.2 g/mol

Number of moles = 990 g / 342.2 g/mol

Number of moles = 2.89 mol

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B) 13-karat

Explanation:

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So now we have<em> a system of two equations</em> (2 and 3) <em>with two unknowns</em>:

We <u>express Vg in terms of Vs</u>:

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We <u>replace the value of Vg in equation 3</u>:

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  • (0.675-Vs) * 19.3 + Vs * 10.5 = 9.40
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Now we <u>calculate Vg</u>:

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  • 5.08 / 9.40 * 100% = 54.04%

B)

We multiply 24 by the percentage fraction:

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