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

no, i was listening to water by schoolboy q while and i saw this question

explenation:

water isn't wet. wetness is a description of our experience of water; what happens to us when we come into contact with water in such a way that it impinges on our state of being. we, or our possessions, 'get wet'. a less impinging sense experience of water is that it is cold or warm, while visual experience tells us that it is green or blue or muddy or fast-flowing. we learn by experience that a sensation of wetness is associated with water: 'there must be a leak/i must have sat in something.'

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.