Question

Anna heated 15 g of Substance A to obtain 5 g of Substance B, 4 g of Substance C, and a certain amount of Substance D. Which statement is correct?

The mass of Substance D was 10 g less than the mass of Substance A.
The mass of Substance D was 1 g greater than the mass of Substance B.
The mass of Substance A was equal to the total mass of Substance C and Substance D.
The mass of Substance A was equal to the total mass of Substance B and Substance D.

Answer 1

The mass of Substance D was 1 g greater than the mass of Substance B.

Step-by-step explanation:

15 g of A → 5 g of B + 4 g of C + x g of D

From the law of conservation of mass, Mass of D should be x = (15 - 5 - 4 ) g = 6 g

This is 1 g more than the mass of B and 2 g more than mass of C.

Thus, correct option is The mass of Substance D was 1 g greater than the mass of Substance B.