Mole is equal to mass of the element divided by molar mass of the element. that is mole=mass/molar mass From periodic table calcium has a molar mass of 40 g/mol moles is therefore =800g/40g/mol=20moles
The question requires us to use the dilution formula , where and are the stock concentration and volume respectively, then and are the dilute concentration and volume respectively.
a. = 1.5 M KCI, =0.20M KCl, =250ml KCl
b.
To prepare the solution 33.3ml of 1.5M KCl is diluted to a total final volume of 250ml.