How many grams of CuSO4 must be dissolved in 100 mL of total solution to create a 0.25 M solution of CuSO4?

3.990225 grams

Explanation:

Remember: Morality = Moles/Liters

And you are given:

100 mL and 0.25

what you want:

Grams

S

convert the 100 ml to L

100 / 1000 = .1 L

now that you have Liters and Morality put it into the equation

0.25 M = Moles/ .1 L

0.25 * .1 L = .025 moles

now you take this and turn it into grams

0.025 moles / molar mass = grams

0.025 moles / 159.609 g = 3.990225 grams

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6