Cis-trans isomerism, also known as geometric isomerism or configurations isomerism is a term used in organic chemistry
Answer:
The correct answer is 378 g of water
Explanation:
A concentration of 5.50% by mass means that there are 5.50 grams of solute in 100 grams of solution:
5.50 %m/m = 5.50 g solute/100 g solution
If we have 22.0 g of solute (KCl), we found the total mass of solution as follows:
5.50 g KCl ----- 100 g solution
22.0 g KCl ------ X = 22.0 g KCl x 100 g solution/ 5.50 g KCl = 400 g solution
22.0 g KCl/400 g solution = 5.5 g KCl/100 g solution = 5.50 % m/m
This is the total mass of solution (400 g). The mass of water we have to add is the following:
Mass water = 400.0 g solution - 22.0 g KCl = 378.0 g
So, in order to prepare a 5.50% m/m of solution, we have to weight 22.0 g of KCl and to add 378.0 g of water until reaching 400.0 g of total mass solution.
Answer:
b) +2 and +3.
Explanation:
Hello,
In this case, given the molecular formulas:
And:
We can relate the subscripts with the oxidation states by knowing that they are crossed when the compound is formed, for that reason, we notice that oxygen oxidation state should be -2 for both cases and the oxidation state of X in the first formula must be +2 since both X and O has one as their subscript as they were simplified:
Moreover, for the second case the oxidation state of X should be +3 in order to obtain 3 as the subscript of oxygen:
Thus, answer is b)+2 and +3
Best regards.
The change is called evolution. They change when the organism adapts to the environment and passes the genes to the offsprings.