Uare given a 30.0g sample of radioactive uranium that has a half-life of 12 hours. how much uranium will be left after 2 days? 1choice 1 3.75g 2choice 2 15.0g 3choice 3 60.0g 4choice 4 1.88g

1.88 g

We are given;

We are required to determine the amount of uranium left after 2 days

N = N₀ × 0.5^n

Where, N is the remaining mass, N₀ is the original mass and n is the number of half lives.

n = (2 × 24) ÷ 12 hours

  = 4

Therefore;

Remaining mass, N = 30.0 g × 0.5^4

                                = 1.875 g

                                = 1.88 g

Therefore, the mass of the remaining sample after decay is 1.88 g

it means there are 3 atoms of oxygen

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