Volume is the amount of space the matter takes up, density is mass OF the volume
Answer:first one: 3.0g second one: 10g H2O(I)
Explanation:
Answer:
Potassium phosphide (K3P)
Molar mass of A l 2 (S O 4 ) 3 = 342.15 g/mol
7.2g/ 342.15 g/mol
you can get number of moles.
then multiply that by12
40 ppm of NaOH
<u>Explanation:</u>
ppm is nothing but the parts per million and it is represented as 1 mg solute per kg of solution.
Here, number of moles of solute (NaOH) can be found as 0.001 mol / L, so we can find the amount of solute as,
Moles =
0.001 mol / L = 
0.001 × 40 = 0.04 g of solute
1 g = 1000 mg
0.04 g = 40 mg
In 1 kg of solution 40 mg of solvent is present.
So the concentration of NaOH is 40 ppm.