When table sugar is burned in air, carbon dioxide and water vapor are products,

Question

When table sugar is burned in air, carbon dioxide and water vapor are products, as shown by the following balanced chemical equation: C_22H_22O_11() + 12 O_2(g) rightarrow 12CO_2(g) + 11H_2O(g) How many moles of oxygen are required to react completely with 3.68 mol of sugar? a. 44.2 b. 65 c. 3.68 d. 88 What is the molar mass of nitroglycerin, C_3H_5(NO_3)_3? a. 179 g/mol b. 227 g/mol c. 199 g/mol d. 185 g/mol Determine the percentage composition (by mass) of oxygen in NH_4 NO_3. a. 72.68 % b. 59.96% C. 19.99 % d. 99.89 % How many calcium atoms are in 16.6 g sample of Ca? a. 10.00 times 10^24 atoms b. 2.49 times 10^23 atoms c. 4.14 times 10^1 atoms d. 16.6 atoms

Explanation / Answer

(3) From the balalnced equation ,

1 mol of sugar requires 12 mol of O2

then, 3.68 mol of sugar requires, 3.68 * 12 = 44.16 mol of O2

(A)

(4)

MOlar mass of nitro glycerin = 3(C) + 5 (H) + 3(N) + 9(O)

MM = 3(12) + 5(1) + 3(14) + 9(16)

MM = 36 + 5 + 42 + 144

MM = 227 g/mol

(b)
(5)

molar mass of NH4NO3 = 80 g/mol

% by mass of O = (48 * 100 / 80) = 60 %

(b)

(6)

40 g. of Ca = 6.022 * 1023 Ca atoms

then, 16.6 g. of Ca = 16.6 * 6.022 * 1023 / 40 = 2.50 * 1023 atoms of Ca

(b)

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