Question 1: When 0.2250 g of magnesium is heated with 0.5331 g of nitrogen in a

Question

Question 1: When 0.2250 g of magnesium is heated with 0.5331 g of nitrogen in a closed container, the magnesium is completely converted to 0.3114 g ofmagnesium nitride. What mass of unreacted nitrogen must remain? Question 2: A compound of uranium and fluorine is used to generate uranium for nuclear power plants. The gas can be decomposed to yield 2.09 parts by mass of uranium for every 1 part by mass of fluorine. If the relative mass of a uranium atom is 238 and the relative mass of a fluorine atom is 19, calculate the number of fluorine atoms that are combined with one uranium atom. Search entries or author Unread

Explanation / Answer

3Mg +N2 ------> Mg3N2 3 moles of Mg reacts with one mole of N2,. 3*. 24 grams of Mg reacts with 28 grams of N2. 0.2250 grams of Mg reacts with N2 is 0.2250/(3*24). *28 = 0.0875 grams of N2 required ,but gave as 0.5331, so remaining N2 left is 0.5331-0.0875 = 0.4456 grams of N2 left.

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