exam Maths Puzzle Numerical Ability

The mass of one mole of hydrogen is 1.008 grams. A 100 gram sample of ascorbic acid contains 4.58 grams of hydrogen. To the nearest tenth, find the number of moles of hydrogen.

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64x to the second -81. birth weights are normally distributed with the mean of 3570g and a standard deviation of 495g. if a hospital wants to watch carefully the lightest 2% of infants, find the weight that seperates the bottom 2% from others.