A student investigates the mass of metal produced during the electrolysis of a salt solution.
The student varies the electric current and passes it for the same duration in each experiment. The results are shown in the table below:
| Current (A) | Mass of metal produced (g) |
|---|---|
| 0.20 | 0.48 |
| 0.40 | 1.02 |
| 0.60 | 1.48 |
| 0.80 | 2.01 |
| 1.00 | 2.51 |
By considering a line of best fit that passes through the origin (0,0)(0,0)(0,0), determine the gradient (rate of mass production per Ampere) in g/A\text{g/A}g/A.
Estimate the current (in A\text{A}A) needed to produce 1.85 g1.85\text{ g}1.85 g of the metal.
Calculate the mass of the metal (in g\text{g}g) that would be produced using a current of 15 A15\text{ A}15 A for the same duration. Give your answer to 2 significant figures.