Answer: 12.92g of CoSO4
Explanation:
Molar Mass of CoSO4 = 59 + 32 + (16x4) = 59 + 32 +64 = 155g/mol
Molarity of CoSO4 = 0.303mol/L
Mass conc. In g/L = Molarity x molar Mass
= 0.303x155 = 46.965g/L
275 grams of water = 0.275L of water
46.965g of CoSO4 dissolves in 1L
Therefore Xg of CoSO4 will dissolve in 0.275L i.e
Xg of CoSO4 = 46.965x0.275 = 12.92g
Therefore 12.92g of CoSO4 is needed
Hi
I think it’s B
Hopefully this helps!!
So pH of the 1.0 * 10-2 mol-1 KOH is 12.
Answer:

Explanation:
Dimensional analysis uses the fact that any number can be multiplied by one without changing its value.
You want to convert hectometres to metres, so you multiply the hectometres by a conversion factor that equals one.
For example, you know that hecto means "× 10², so
1 hm = 100 m
If we divide each side by 1 hm, we get 1 = 100 m/1 hm.
If we divide each side by 100 m, we get 1 hm/100 m = 1.
So, we can use either (100 m/1 hm) or (1 hm/100 m) as a conversion factor, because each fraction equals one.
We choose the former, because it has the desired units on top.
The calculation becomes
