Astudent is told to use 20.0 g of sodium chloride to make an aqueous solution that has a concentration of 10.0 g/l (grams of sodium chloride per liter of solution). assuming that 20.0 g of sodium chloride has a volume of 7.50 ml, show that she will need about 1.99 l of water to make this solution. in making this solution, should she add the solute to the solvent or the solvent to the solute?

Explanation:

Concentration of sodium chloride = 10.0 g/L

1 Liters of solution has 10 g of sodium chloride

The volume of solution in which 20 g of sodium chloride will present is:

Volume of solution we will be making is of 2 L.

Volume of 20 g of sodium chloride = 7.50 ml = 0.00750 L

Volume of the water = ?

Volume of solution = Volume of solute + Volume of solvent

Volume of solvent = 2L - 0.00750 L = 1.9925 L

So,volume of water required to prepare the 2 L of 10 g/L solution of sodium chloride is 1.9925 L.

And for while making of the solution , student must add solute the solvent.

b would be the answer

when a device is used in a circuit in which the voltage is 81 v, the current flowing through the device is 3 a. what is the resistance of the device?

a. 27 ω

b. 40.5 a

c. 243 ω

d. 243 a

the correct answer is a. 27