The mass of the substance remaining after 60 minutes is determined as 5.28 g.
How to calculate the mass of the substance remaining?
The mass of the substance remaining after 60 minutes is calculated by applying the following method as follows;
From the graph, the percentage of the unstable nuclei remaining is plotted on the y- axis while the time of decay is plotted on the x-axis.
At the time of 60 minutes, the corresponding percentage of the mass remaining is 12%.
The given initial mass of the substance = 44 g
The percentage of the mass remaining after 60 mins = 12%
The mass remaining after 60 minutes is calculated as;
= 0.12 x 44 g
= 5.28 g