Question

How many grams of NaOH would you dissolve in pure water to make 400 mL of a 2.5% NaOH solution ? MW of NaOH = 40 g/mol

Answer 1

Please help, im currently stuck

Answer 2

If milk has a density of 1.03 g/mL, what is the mass of 9.00 qt, reported in kilograms?

Answer 3

Is that % w/v or w/w. I will assume w/v.

2.5% w/v means 2.5 g/100 mL.
You want 400 mL so
2.5 x (400/100) = ?

Answer 4

If you want an answer it is better to post a new question and not piggy back on another student's question.
1. Convert 9.00 qt to mL. 1 qt = 946 mL.

2. Then mass = volume x density
Substitute and solve for mass (n grams).

3. Convert grams to kg.