How many grams of a stock solution that is 87.0 percent H2SO4 by mass would be needed to make 200 grams of a 35.5 percent by mass solution? Show all of the work needed to solve this problem.

Question

photon336 · Answer

you weren't given any more information right?

anonymous · Answer

thats all that was given to me

anonymous · Answer

What do you know in general though?

anonymous · Answer

Are you adding water to it or something?  What is the percent of the solution you're adding  to it?

photon336 · Answer

No concentration was given? usually the stock solution has a concentration

photon336 · Answer

Ah i see

anonymous · Answer

My only guess is that you're adding water to it, or something with 0% solution.
In that case $s$ is grams of solution, and $w$ is grams of water.$$
s+w=200\
0.87s + 0w = 0.355(s+w)
$$

anonymous · Answer

My top equation is just the total grams equation.
My bottom equations is the total $H_2SO_4 $ grams equation.