How to determine:
1) mass of bacl2.xh2o?
2) mass of barium chloride anhydrous?
3) mass of water in bacl2.xh2o?
4) percent composition of water in bacl2.xh2o?
5) formula of barium chloride hydrate?

1) 57.8310g - 56.5622g = 1.2688 g hydrate 

2) 57.6362g - 56.5622g = 1.07400 g anhydride 

3) 57.8310g - 57.6362g = 0.1948 g water 

4) (0.1948 g water) / (1.2688 g hydrate) = 0.1535 = 15.35% water 

5) 15.35% water = 84.65% BaCl2 

(208.2330 g/mol BaCl2) / (0.8465) = 245.99 g/mol hydrate 

((245.99 g/mol) - (208.2330 g/mol BaCl2)) / (18.01532 g H2O/mol) = 2.096 

Round to the nearest whole number (2) to find the molar ratio of water to BaCl2: BaCl2·2H2O

if the concentration of products is decreased, the equilibrium will shift toward the products). add an inert gas (one that is not involved in the reaction) to the constant-volume reaction mixture: this will increase the total pressure of the system, but will have no effect on the equilibrium condition.

explanation:

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e