How many grams of solute are needed to make 2.50 liters of a 0.100 m soultion of kcl?

Molarity =number of mole solute/volume (L) solution.
volume (L) solution = 2.50 L
Molarity= 0.100 M KCl

0.100 M KCl =number of mole solute/2.50 L solution

number of mole solute(KCl)= 0.100 M KCl*2.50 L =0.100*2.50 (mol/L)*L =
=0.250 mol KCl

mass (solute) KCl = Molar mass KCl* number of mole solute(KCl)

Molar mass KCl = 39.1+35.5= 74.6 g/mol

0.250 mol KCl * 74.6 g/mol KCl = 18.7 g KCl

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .