D. more than one of the above are correct E. none of the above are correct 21· T

Question

D. more than one of the above are correct E. none of the above are correct 21· The value of AHo for the reaction below is-482 kJ. Calculate the heat (k) released to the surroundings when 6.00 g of CO (g) (M.W- 28 g/mol)reacts completely. 2CO (g) + O2 (g) ? 2C02 (g) 11-.482 ks. A) 1450 B) 103 C) 51.6 D) 482 E)-482 22). A cheeseburger from a fast food restaurant contains 19 g of fat, 20 g of carbohydrate, and 28 g of protein. How many kcal of energy does the cheeseburger contain? (The accepted caloric values for foods are 4.0 kcalg for carbohydrate, 9 kcal'g for fat, and 4 kcallg for protein.) Report the answer to 2 significant figures. A) 70. kcal B) 360 kcal C) 17 kcal D) 630 kcal E) 280 kcal 23). Calculate the density, in g/L, of SFs gas at 27°C and 0.500 atm pressure. A. 3.38 x 10' g/L B. 2.96 g/L C. 22.4 g/L D. 32.9 g/L

Explanation / Answer

21)

Molar mass of CO,
MM = 1*MM(C) + 1*MM(O)
= 1*12.01 + 1*16.0
= 28.01 g/mol


mass(CO)= 6.00 g

use:
number of mol of CO,
n = mass of CO/molar mass of CO
=(6.0 g)/(28.01 g/mol)
= 0.2142 mol
Since ? H is negative, heat is released
when 2 mol of CO reacts, heat released = 482.0 KJ
So,
for 0.2142 mol of CO, heat released = 0.2142*482.0/2 KJ
= 51.62 KJ
Answer: 51.6 KJ

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