Question

A certain amount of a metal whose equivalent mass is 28 displaces 0.7 l of h2 at stp from an acid hence mass of the element is 1) 1.75g 2)0.875g 3)3.50g 4)7.00g

Answer 1

1 mole of Hydrogen at STP occupies 22.4 litres volume.

Number of moles of 0.7 litres of Hydrogen at STP is 0.7/22.4 = 0.0313 moles

Weight of element (x) = Moles of Hydrogen times equivalent weight of metal times mass of Hydrogen

x = 0.0313*28*2

x = 1.7528 grams

Answer 2

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