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Dafna11 [192]
3 years ago
12

U-236 spontaneously decays to Br-87, X and three neutrons. What is element “X”? 1. Th 2. Pb 3. Ra 4. La 5. Ba

Chemistry
1 answer:
Elena-2011 [213]3 years ago
6 0
<span>U-236 spontaneously decays to Br-87, X and three neutrons. The element X is 4. La, also known as Lanthanum, number 57 in the periodic system of elements.</span>
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In the decomposition potassium nitride, 10.65 g of nitrogen form. How much potassium nitride was present initially ?
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Answer:

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Explanation:

Given data:

Mass of potassium nitride = ?

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Solution:

Chemical equation:

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Moles of nitrogen:

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Now we will compare the moles of nitrogen with potassium nitride.

                        N₂              ;         K₃N

                         1               :            2

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Mass of potassium nitride:

Mass = molar mass × number of moles

Mass =    131.3 g/mol ×   0.76 mol

Mass =  99.8 g    

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Answer:

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