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Chapter 3: Q3.6 CYL (page 138)

How many moles of sucrose, C12H22O11, are in a 25-g sample of sucrose?

Short Answer

Expert verified

No. of moles of sucrose is equal to \(0.073{\rm{ mol}}\)

Step by step solution

01

Determine molecular mass 

To calculate no of moles of sucrose, we have to evaluate the molar mass of sucrose first.

Element

Quantity

Molar mass

(g/mol element)

Subtotal

(g/mol compound)

C

12

×

12.01

=

144.12

H

22

×

1.008

=

22.176

O

11

×

16.00

=

176.00

Molecular mass(g/mol)

=

342.296

02

Determine no of moles

No of moles = \(25{\rm{ g sucrose }} \times {\rm{ }}\frac{{{\rm{mol of sucrose}}}}{{342.296{\rm{ g sucrose}}}} = 0.073{\rm{ mol of sucrose}}\)

Hence, no of moles of sucrose is equal to\(0.073{\rm{ mol}}\)

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Most popular questions from this chapter

Write a sentence that describes how to determine the number of moles of a compound in a known mass of the compound if we know its molecular formula.

Question: A certain nut crunch cereal contains 11.0 grams of sugar (sucrose, C12H22O11) per serving size of 60.0 grams. How many servings of this cereal must be eaten to consume 0.0278 moles of sugar?

What volume of a 1.50-MKBr solution contains 66.0 g KBr?

Determine the number of moles of the compound and determine the number of moles of each type of atom in

each of the following:

(a) 2.12 g of potassium bromide, KBr

(b) 0.1488 g of phosphoric acid, H3PO4

(c) 23 kg of calcium carbonate, CaCO3

(d) 78.452 g of aluminum sulfate, Al2(SO4)3

(e) 0.1250 mg of caffeine, C8H10N4O2

Beryllium is a light material used to fabricate transparent x rays windows for medical imaging instruments. How many moles of Beryllium are in a thin foil window weighing 3.24g?
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