Thimerosal is an organic compound (gram-molecular mass - 404.8 g/mol) used to inhibit bacterial growth. A 0.100%
solution of thimerosal is sometimes used as an antiseptic.
Assume that this solution has a density of 1.00 g/mL.
a. How many grams of thimerosal are found in 0.500 g of
0.100% solution?
b. How many grams of thimerosal are required to make
50.0 g of 0.100% solution?
c. What mass of thimerosal must be mixed with 25.0 g of
water to make a 0.100% solution?
d. How many grams of thimerosal are required to make
75.0 mL of 0.100% solution?
e. What volume of 0.100% solution contains 0.750 g of
thimerosal?

answer; i believe that the correct answer is (a) potassium(k)

it's all four options.

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied