Question

1. In an experiment magnesium ribbon is added to 25g of hydrochloric acid, an excess.

Mg (s) + 2HCI (aq) → MgCl₂ (aq) + H₂ (g)
what is the mass of mgcl2??
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Answer 1

19.59 g MgCl2 to the nearest hundredth.

Step-by-step explanation:

Mg (s) + 2HCI (aq) → MgCl₂ (aq) + H₂ (g)

1 mole of Mg produces 1 mole of MgCl2

Using the molar masses of the elements:

24.305 g Mg produces (24.305 + 2 * 35.45) g MgCl2

So 5g ---> 5 * (24.305 + 2 * 35.45) / 24.305

= 19.59 g MgCl2 to the nearest hundredth.