Question

If after heating the reaction between magnesium and hydrochloric acid, the mass of the magnesium chloride and beaker is measured to be 37.83 g, what is the mass of magnesium chloride that was formed, if the mass of the beaker is 33.95 g. Enter answer to two decimal places

Answer 1

Since the beaker was heated we can asume that only magnesium cloride is left in the beaker, therfore the difference between the beaker with magnesium chloride and the empty beaker give the mass of magnisium chloride:

$\text{mass MgCl}_2=massbeakerwithMgCl_2-mass\text{ emprty beaker =37.83 g - 33.95g = 3.8}8g$