How much heat is transferred when 1.56 g of ammonia reacts with excess oxygen according to the following equation
4NH3(g) + 5O2(g)  4NO(g) + 6H2O(g) H = -905.4 kJ

answer: c.

explanation:

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.

here are some of the ways in which chemical and nuclear reactions differ.

explanation: