1. What volume in mL of 28.0M H2SO4 is needed to contain 53.0g of H2SO4?

2. How many grams of calcium hydroxide Ca(OH)2 are needed to make 532.0 mL of a 1.90M solution?

3. If 12 mL of water are added to 124mL of a 0.505M K2SO4 solution, what will the molarity of the diluted solution be?

1. V=19.3 ml

2. mass=74.8g

3. molarity of dilted solution=0.463M

Explanation:

1.

First calculate the mole ,

given mass=53g

molecular weight=98g/mole

mole=0.54

molarity=28M

V=19.285ml

V=19.3 ml

2.

First calculate the mole of calcium hydroxide,

molariy=1.9M

volume=532 ml=0.532L

mole=1.01 mol;

molecular weight of calcium hydroxide= 74g/mol

mass=74.8g

3.

First calculate the mole before adding water

molariy=0.505M

initial volume=124 ml=0.124L

mole=0.063 mol;

after dilution volume=136 ml =0.136L

quantity of solute remains unchanged during dilution of solution.

molarity of dilted solution=0.463M

answer: they produce more slow than unicellular organisms.