In the combination reaction between oxygen and magnesium, 12.25 grams of magnesium were consumed. Assuming the reaction took place at STP, how many
liters of oxygen were required to completely react with the magnesium?

2 Mg + O2 → 2 MgO b. From the reaction in the previous question, how many moles of oxygen are needed to completely react with 12 moles of magnesium.

Explanation:

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the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3