Question

The graph shows the mass of a radioactive substance as a function of time.

Enter the initial mass of the substance in the box

?? = g

Answer 1

Base from the graph, the initial mass of the substance can be found by looking at the value y – axis ( the mass of the substance) when the x – axis ( time ) is equal to zero. So the mass of the substance is 45 g.

Answer 2

Just took the test, and as shown below the answer is 45 g.

Hope this helps :)!