How much heat is absorbed/released when 20.00 g of nh3(g) reacts in the presence of excess o2 (g) to produce no (g) and h2o (l) according to the following chemical equation? 4nh3 (g) + 5o2 (g) > 4no (g) +6h2o (l) δ h: +1168 kja. 342.9 kj of heat are absorbed. b. 342.9 kj of heat are released. c. 1372 kj of heat are absorbed. d. 1372 kj of heat are released.

a. 342.9 kJ of heat are absorbed.

Explanation:

Calculation of the moles of as:-

Mass = 20.00 g

Molar mass of = 17.031 g/mol

The formula for the calculation of moles is shown below:

Thus,

Given that:-

It means that 1 mole of undergoes reaction and absorbs 1168\ kJ of heat

So,

1168 mole of undergoes reaction and absorbs of heat

Amount of heat absorbed = + 342.9 KJ

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.