Using the values of standard enthalpy of formation NH3 = -46.19 KJ/mol

N2H4 = 95.40 KJ/mol

H2O = -285.83 KJ/mol

determine the standard enthalpy of formation for the reaction

4NH3 + O2 --> 2 N2H4 + 2 H2O

the sum of reactants is KJ/mol

the sum of products is KJ/mol

The heat of formation is KJ/mol

Explanation for basic character?

Aperfume bottle is dropped in the corner of a room. the odor of the perfume can be detected on the other side of the room. which statement best describes this observation?

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.