Which of the following represents a pair of isotopes? A) 146C, ...

[CharlieWard]

Which of the following represents a pair of isotopes?
 
  A) 146C, 147N
  B) 11H, 21H
  C) 3216S, 3216S-2
  D) O2, O3

Question 2

When 1.50 mol of CH4(g) reacts with excess Cl2(g) at constant pressure according to the chemical equation shown below, 1062 kJ of heat are released.
 
  Calculate the value of H for this reaction, as written.
 
   2 CH4(g) + 3 Cl2(g)  2 CHCl3(l) + 3 H2(g) H = ?
 
  A) -1420 kJ
  B) -708 kJ
  C) +708 kJ
  D) +1420 kJ

Question 3

At constant pressure, the combustion of 15.0 g of C2H6(g) releases 777 kJ of heat. Calculate H for the reaction given below.
 
  2 C2H6(g) + 7 O2(g)  4 CO2(g) + 6 H2O(l)
 
  A) -129 kJ
  B) -779 kJ
  C) -1560 kJ
  D) -3120 kJ

Question 4

Calculate the number of grams of solute in 500.0 mL of 0.189 M KOH.
 
  A) 148
  B) 1.68
  C) 5.30  103
  D) 5.30
  E) 1.68  10-3

[aprice35067]

Answer to Question 1

B

Answer to Question 2

A

Answer to Question 3

D

Answer to Question 4

D

[CharlieWard]

Wow, this really help

[miss_1456@hotmail.com]

Thanks for the timely response, appreciate it