Answer: 2mg
Part per million is unit that equal to mg/kg of water or simply

. In this case, you asked how much NaCl needed and know the volume of water(100mL), concentration(20ppm or 20 mg/kg) and water density.
Then, the equation would be
concentration = NaCl weight/ water weight
20 x

mg= NaCl weight/ (100ml x 1g/ml)
NaCl weight= 20x

mg/kg x 100g
NaCl weight= 2000 x

g
NaCl weight= 2x

g = 2mg
Answer:
20 kg
Explanation:
the mass wont change, so it will still be 20 kg
hope this helps :)
<span>Clouds are made of tiny drops of water or ice crystals that settle on dust particles in the atmosphere. The droplets are so small - a diameter of about a hundredth of a millimetre - that each cubic metre of air will contain 100 million<span>droplets</span></span>
Answer:
c.11.43 g of aluminum hydroxide
Explanation: