Please. make sure you give me right answer and clear Which of the following comp
ID: 975945 • Letter: P
Question
Please. make sure you give me right answer and clear
Which of the following comparisons of size is correct? Cl^- > K^+ and Al > P K^+ > Cl^- and P > Al Cl^- > K^+ and P > Al K^+ > Cl^- and Al > P The following balanced equation is used to answer questions: 16, and 17. 2NO_2(g) + 7H_2(g) rightarrow 2NH_3(g) + 4H_2P(g) H= -1126 kJ How many liters of NO_2(g) at 25.0 degree C and 0.945 atm are required to produce 45.0g H_2O(g)? lf 23.0g NO_2(g) and 10.0g H_2(g) are reacted to completion, how much heat is produced?Explanation / Answer
Trends in ionic radii says that adding electrons make atoms larger and emoving electrons make them smaller. So K+ is smaller than Cl-. In a particular row the atoms on the left is smaller than the ones on the right as we are adding electrons and protons to the atom so phosphorous is larger than Al.
So the correct answer is
c. Cl->K+ and P>Al
16. As per the equation 2 moles of NO2 will give 4 moles of H2O
45 g of H2O is 45/18 = 2.5 moles of H2O is produced.
so we need 2.5/4 x 2 = 1.25 moles of NO2.
PV = nRT
0.945 atm x V = 1.25 x 0.08206 x (273+25)
V = 32.25 L
So we need 32.25 L of NO2.
17) 23 g of NO2 is 23/46 g/mol = 0.5 mole of NO2
10 g of H2 is 10/2 = 5 moles of H2
2 mole of NO2 reacts with 7 moles of H2 so
0.5 moles of H2 needs 3.5 mole of H2 so limiting reagent is NO2.
2 moles of NO2 generates -1126 kJ of heat so 0.5 moles of NO2 generates
-1126/2 x0.5 = 281.5 kJ of heat is produced