how many milliliters of10.0m Hc(aq) are needed to prepare 890.0 ml of 1.00m Hcl(aq)

1 answer

One thing you need to learn in chemistry:
A MUST. Locate the caps key on your computer and USE it.
m is not M. I assume you meant molarity (M) and not molality(m). If it is m you can't work the problem with the information provided. If it is M, then
mL1 x M1 = mL2 x M2
mL1 x 10.0M = 890.0 mL x 1.00M
Solve for mL 1 you need to use to make the 890.0 of 1.00M HCl.