When 0.25 moles of carbon monoxide reacts with oxygen to give carbon dioxide. 14

Question

When 0.25 moles of carbon monoxide reacts with oxygen to give carbon dioxide. 142 kg of heat are given off delta H degree for the following reaction is: CO (g) + 1/2 O_2 (g) rightarrow CO_2 (g) (a) -11.36 kJ (b) -142 kJ (c) 568 kJ (d) 142 kJ (e) -568 kJ A 50.0 g sample of H_2 O (l) at 22.0 degree C in an insulated container absorbs 2.09 kJ of heat. What is the final temperature of the water? Specific heat of H_2 O (l) = 4.18 J/g degree C. (a) 22.5 degree C (b) 10.0 degree C (c) 25.0 degree C (d) 41.8 degree C (e) 32.0 degree C In a spectroscopic experiment, the following wavelength of radiation were identified. Which one has the highest frequency? (a) 500 nm (b) 800 nm (c) 1200 nm (d) 210 nm (e) 650 nm What volume of alcohol (density 0.800 g/ml) is needed to obtained 320 g of alcohol? (a) 100 ml (b) 320 ml (c) 400 ml (d) 256 ml (e) 80 ml If 1.0 g of H_2 reacts with excess N_2 according to the reaction below, how much NH_3 will be 3H_2 (g) + N_2 (g) rightarrow 2 NaH_2 (g) (a) 34 g (b) 5.7 g (c) 17 g (d) 1.0 g (e) 11.3 g The following number determines which one of the following: (a) atomic mass (b) number of protons in the nucleus (c) mass number (d) number of neutrons in the nucleus (e) number of isotopes How many electrons are there in an atom of function, F? (a) 9 (b) 19 (c) 28 (d) 10 (e) 18 What is the ratio of atoms of hydrogen to atoms of oxygen, HO in ammonium sulfate, (NH_4)_2 SO_4? (a) 1:1 (b) 8:1 (c) 3:2 (d) 2:1 (e) 4:1 The formula mass of Al (BrO_3)_3 is: (a) 555 (b) 411 (c) 155 (d) 177 (e) 351

Explanation / Answer

Question 1

The reaction to the problem is:

CO + 1/2O2 -> CO2

When 0.25 moles of CO react with stoichiometric O2, 142kJ of heat are released (q = -142 kJ).

To get rH we need to calculate how much heat would be released with 1 mole of CO, or we just divide q/moles CO:

rH = q/moles CO

rH = -142kJ / 0.25 moles CO

rH = -568 kJ/mol

So, the correct answer is (e) -568 kJ

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