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:
Both sodium and calcium.
Explanation:
The membrane potential is maintained inside and outside of the cell due to the unequal distribution of the different ions. This membrane potential difference is important for the generation of action potential.
The resting membrane potential is around +30 mV. This is due to the presence of potassium ions. The sodium and calcium ions must enter in the cell to change this membrane potential and generates the action potential in the body.
Thus, the correct answer is option (3).
Answer:
The total pressure is 724 mmHg
Explanation:
If you want to know the total pressure of the mixture, you must sum each partial pressure.
555 mmHg + 149 mmHg + 13 mmHg + 7 mmHg = 724 mmHg
Answer:
A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. The scientific study of crystals and crystal formation is known as crystallography.
Explanation:
