A 1.75 g sample of magnesium and iron is added to dilute hydrochloric acid, producing 1.1 L of hydrogen gas at 28.5 0C and 765 mmHg. What is the percent composition (by mass) of the original sample to the nearest whole number? (Hint: magnesium and iron react with HCl according to the following equations): Mg(s)+2HCl(aq)→MgCl2 (aq)+H2 (g) Fe(s)+2HCl(aq)→FeCl2 (aq)+H2 (g)

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.