So the situation is that there are 2 identical beakers both with sodium thiosulphate in them; there are crosses on paper underneath them and basically as sulphur is added the crosses become decreasingly visible; here's the question:
Q) the cross disappears after 0.1 g of sulphur appear to make the solution cloudy. If the rate of reaction on the graph is measured in g/s calculate how long it tookthe cross to disappear at 0.50 mol. dm-3 sodium thiosulphate solution.
Any hints or help?