Which compound will be the least soluble in water? Which cylinder at STP will co

Question

Which compound will be the least soluble in water? Which cylinder at STP will contain the greatest number of gas particles? a 5.0-L cylinder of nitrogen All of the cylinders above contain the same number of gas particles. a 5.0-L cylinder of helium a 5.0-L cylinder of hydrogen a 5.0-L cylinder of neon Consider the reaction, C2H4(g) + H2(g) rightarrow C2H6(g), where Delta H = -137 kj. How many kilojoules are released when 3.5 mol of C2H4 reacts? 570 KJ are released 137 KJ are released 480 KJ are released 2.0 Times 103 kj are released Potassium metal (K) reacts violently when added to water according to the balanced equation: How many moles of H2O are needed to react completely with 7.54 mol of K? 15.1 mol 2 mol 7.54 mol 3.77 mol What is the concentration of a solution formed by diluting 25.0 mL of a 3.2 M NaCl solution to 135.0 mL? 2.7 M NaCl 0.59 M NaCl 17 M NaCl 0.50 M NaCl Consider the balanced reaction: Zn(s) + 2 HCl(aq) rightarrow ZnCl2(aq) + H2(g). What volume of H2(g) at STP can be generated when 134 g of zinc reacts? 3.00 Times 103 L 45.9 L 2.05 L 5.98 L What is the volume of 62.3 g of nitrogen gas at STP? 99.6 L 49.8 L 22.4 L 2.78 L

Explanation / Answer

1) c

2)B

3)
for 1 mole .......... 137 Kj
3.5 mol..........?
= 479.5 Kj
so the ans is C

4)M1V1 = M2V2
25*3.2 = 135*M2
M2 = 0.59 M
so the option B is correct

5)
for 1mole of Zn ...... 1mole of H2 gas releaes
(134/65.38) moles of Zn ........?
= 2.049 moles of H2 gas
for 1mole of H2 at stp ............. 22.4lt
2.049 moles of H2 ............?
= 45.9 lt

so the option B is correct

6)
for 1mole of N2 at stp ............. 22.4lt
(62.3/28) mole sof N2 ...........?
= 49.84 lt
so the option B is correct

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