Question

Calculate the moles of magnesium that reacted.
Lab results:
mass of beaker:41.9293 g
mass of magnesium: .8712 g
mass of beaker and magnesium chloride after hot plate: 42.9318 g
mass of beaker and magnesium chloride after heating: 42.4513 g
We added 10-15 mL of 3.0 M HCL until no more magnesium remained unreacted. Put beaker onto hotplate and allowed product to dry. then but into drying oven overnight. Took out the beaker and set up a ring and wire gauze. Put the beaker on the wire guaze with a bunsen burner underneath. Heated the beaker until no liquid remains and then let cool.

Answer 1

You had the mass earlier. Now use: \(\sf moles=\dfrac{mass}{Molar~mass}\)