1. (nh)2cro-
a) number of moles of h:
b) number of moles of n:
2. ag. so.
a) molar mass:
b) percent composition of ag:
c) percent composition of s:
d) percent composition of o:

Question:

1. (NH)2CrO

a) Number of moles of H:

b) Number of moles of N:

a) Number of moles of H: 2

b) Number of moles of N: 2

Explanation:

The   is ammonium Chromate which is monoclinic and yellow Crystal that is formed due to the reaction of ammonium Hydroxide and ammonium di-chromate. It is used as catalyst, corrosion inhibitor as well as analytical inhibitors.

Question:

2. Ag.SO.

a) Molar Mass:

b) Percent Composition of Ag:

c) Percent Composition of S:

d) Percent Composition of O:

a) Molar Mass:   155.93 Kg

b) Percent Composition of Ag:   69%

c) Percent Composition of S:  20.5%

d) Percent Composition of O: 10.2%

Explanation:

Molar mass =   molar mass of Ag +  molar mass of S +  molar mass of O  

=>107.87+32.06+16

=> 155.93 Kg

Percent Composition of Ag

=

=

= 0.69 \times 100

= 69%

Percent Composition of S:

=

=

= 0.205 \times 100

= 20.5%

Percent Composition of O:

=

=

= 0.102 \times 100

= 10.2%

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.