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Question

a Secure aleks.com/alekscgi/x/lsl.exe/1o_u-lgNslkr7j8P3jH-LiOUdvliUe84Tp2eqtVT3Kk4hS-xm Whf4 Calculating the heat of reaction from molar reaction enthalpy and... A chemist measures the energy change AH during the following reaction: 2N02(g)-N-04(g) AH=-55.3 kJ Use the information to answer the following questions. This reaction is... endothermic. exothermic Yes, absorbed. Suppose 39.4 g of NO, react. Will any heat be released or absorbed? Yes, released. No If you said heat will be released or absorbed in the second part of this question, calculate how much heat will be released or absorbed. Round your answer to 3 significant digits.

Explanation / Answer

1)

since H is negative, the reaction is exothermic

Answer: exothermic

2)

Reaction is exothermic

SO, heat is being released

Answer:

yes, released

3)

Molar mass of NO2 = 1*MM(N) + 2*MM(O)

= 1*14.01 + 2*16.0

= 46.01 g/mol

mass of NO2 = 39.4 g

we have below equation to be used:

number of mol of NO2,

n = mass of NO2/molar mass of NO2

=(39.4 g)/(46.01 g/mol)

= 0.8563 mol

from reaction,

2 mol of NO2, heat released = 55.3 KJ

So,

heat released = mol of NO2 reacting * 55.3/2

heat released = 0.8563 * 55.3 / 2 KJ

heat released = 23.7 KJ

Answer: 23.7 KJ

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