1. The reaction of glucose (C 6 H 12 O 6 ) with oxygen gas produces carbon dioxi

Question

1. The reaction of glucose (C6H12O6) with oxygen gas produces carbon dioxide and water. The energy released during this reaction is 2802 kJ/mol of glucose. How many kilojoules from 80 g of glucose in some food?

1245 kJ

2802 kJ

35 kJ

2.2 x 105 kJ

Impossible to tell with the information given.

2. Consider the reaction: C(s) + H2O(g) --> CO(g) + H2(g)

How many Liters of H2 gas are formed from the complete reaction of 15.7 g C? The gas was collected at a pressure of 1.0 atm and a temperature of 355 K.

457 L

228 L

76 L

38 L

1245 kJ

2802 kJ

35 kJ

2.2 x 105 kJ

Impossible to tell with the information given.

Explanation / Answer

1.

Molar mass of glucose = 180. g/mol

So,

energy released from 180 g. of glucose = 2802 kJ

Then,

energy released from 80 g. of glucose = 2802 * 80 / 180 = 1245. kJ

(A)

2.

From the balanced equation,

1 mol ( 12 g. ) of C produces 1 mol of H2

then,

15.7 g. of C produces 15.7 * 1 / 12 = 1.31 mol of H2

Using ideal gas equation,

P V = n R T

1.00 * V = 1.31 * 0.0821 * 355

V = 38.2 L

(D)

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