7.Pulling Forces
8.Opposite
9.Not equal
10.Do not balance each other
11.left
12.right
13.left
How many grams of oxygen are required for the complete combustion of 47.2 g of butane, C4H10?
2C4H10 + 13O2 = 8CO2 + 10H2O
Explanation:
Epsom salt, magnesium sulphate, or MgSO4.7H2O comes in different hydrates.
The heptahydrate (.7H2O) comes in as Epsom salt.
It readily loses one water of crystallization, or by gentle heating, to become the hexahydrate, (.6H2O).
When heated to 150 ° C, it further lose water of crystallization to the monohydrate (.H2O)
Finally, when heated to 200 ° C, it becomes anhydrous, i.e. a powder that has no more water of crystallization.
(ref. Wiki)
