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The mass of a box measured by a grocer's balance is 2.3 ~kg . Two gold pieces of masses 20.15 ~g and 20.17 ~g are added to the box. What is the total mass of the box and the difference in the masses of the pieces to correct significant figures?

Options

  1. A2.34 ~kg , 0 ~g
  2. B2.3 ~kg , 0.02 ~g
  3. C2.34 ~kg , 0.02 ~g
  4. D2.3 ~kg , 0 ~g

Correct answer

B. 2.3 ~kg , 0.02 ~g

Step-by-step solution

aligned Total mass = & 2.3 ~kg +0.02015 ~kg & +0.02017 ~kg = & 2.34032 ~kg =2.3 ~kg aligned Difference of mass of the gold pieces =20.17 ~g -20.15 ~g =0.02 ~g

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