25. Global warming is thought to be caused by the increase of one particular gas

Question

25. Global warming is thought to be caused by the increase of one particular gas. Name the gas.

(A). oxygen (B). argon (C). carbon dioxide (D) nitrogen (E). helium

26. How many grams of Li3N can be formed from 1.75 moles of Li? Assume an excess of nitrogen. 6 Li(s) + N2(g) --> 2 Li3N(s)

(A). 28.3 g Li3N (B). 20.3 g Li3N (C). 18.9 g Li3N (D). 1.10 g Li3N (E). 1.50 g Li3N 4

27. How many moles of nitrogen are formed when 25.0 g of KNO3 decomposes according to the following reaction? The molar mass of KNO3 is 101.1 g/mol. 4KNO3(s) 2K2O(s) + 2N2(g) + 5O2(g)

Explanation / Answer

25) carbondioxide

26) 6 Li(s) + N2(g) --> 2 Li3N(s)

according to balaced equation 6 moles of Li gives 2 moles of Li3N

for 1.75 moles=?

the no. of moles of Li3N produced =(1.75*2)/6=0.58moles=0.58*34.83=20.2014g

27) no. of moles for 25.0 g of KNO3 = 25/101.1=0.24moles

     4KNO3(s) => 2K2O(s) + 2N2(g) + 5O2(g)

according to balanced equation 4moles of KNO3 gives 2 moles of N2

   for 0.24 moles of KNO3=?

the no. of moles of N2 produced=(0.24*2)/4=0.12moles.

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