375 ml of a 0.455 m sodium chloride (nacl) solution is diluted with 1.88 l of water. what is the new concentration in molarity?

0.0757 M

Explanation:

The question asks for the new concentration of a solution after being diluted. For this we can use the dilution formula:

M₁ V₁ = M₂ V₂

Where M stands for molarity and V for volume, so M₁ and V₁ are the initial values for molarity and volume, and  M₂ and V₂ are the final values of molarity and concentration.

So

M₁ = 0.455 M

V₁ = 375 mL = 0.375 L (because 1 L  = 1000 mL)

The question says the solution is diluted with 1.88 L of water, so to the initial 375 mL of solution, 1.88L of water are added, hence the final volume is:

V₂ = 0.375 L + 1.88L = 2.255 L

M₂ is the final concentration which we want to calculate, so from the formula we get:

M₂ = (0.455 M × 0.375 L) / 2.255 L = 0.0757 M

The new concentration after the dilution is 0.0757 M

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds