The rate of reaction between magnesium and excess dilute hydrochloric acid was followed by measuring the mass of magnesium present at regular time intervals, two experiments were performed. Both experiments used 0.1 g of magnesium ribbon. The acid in experiment 1. was less concentrated than experiments 2,

Which graph shows the results of experiments?

 

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a) b) Mass of Mass of magnesium Magnesium 2 0|1 Time Time c) d) Mass of 2 Mass of Magnesium Magnesium 2 Time Time