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4. An 8.20 g piece of magnesium combines with 5.40 g of oxygen to form a compound. What is the percent composition of Mg and O in this compound?​

Sagot :

JIENNADYNN13IN

Answer:

One mole of gas at STP would occupy 22.4 liters, this gas is 1.25 g/liter so in 22.4 virtual liters it will have a mass of 28 grams, so the MW= 28g/mol and the gas is N2

Explanation:

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