Question

. A solution of salt and water contains 60 grams of water per 120 milliliters of the solution. If 1 mole of water weighs 16 grams, _____ moles of water would be present in 40 milliliters of the solution

Answer 1

how many moles in first solution??

Answer 2

It doesnt say

Answer 3

I wanna know how to solve these type of problems

Answer 4

well 60/16 is the moles and 40/120 is a third, i would say the answer of 60/16 mult by a third.

Answer 5

I still kinda dont get it

Answer 6

these are ratio problems kind of like this

1mole of water/16 g= x mole of water/60 g = 60/16 = moles of water

then

that answer/120 ml = how many moles/40 = 40(that answer)/120= how many moles in 40

Answer 7

But it doesnt say how much water each mole has. It says it weighs 16 grams

Answer 8

yes there are 16 g/mol in water or 16 grams in 1 mole of water so how many moles in 60

hence 60/16 that is how many moles there are in 60 grams of water

Answer 9

16 x 3.75 = 60 so 3.75 moles?

Answer 10

ok now you know there are 3.75 moles per 120ml take that answer and plug it in the 2nd formula

Answer 11

so do i do 3.75 / 40?

Answer 12

per means divided by so 3.75/120 = x/40

or 40(3.75)/120

Answer 13

it equals 0.0007812

Answer 14

no punch in 40 times 3.75 and then divide by 120 you should get 1.25

Answer 15

Ok. I used your first formula 3.75/120 = x/40. Now its asking me to "Round off your answer to two decimal places"

Answer 16

it is already

Answer 17

good job!! next time post this under chemistry.

Answer 18

Its in my math class.

Answer 19

But thank you so much!!

Answer 20

so whats the answer