Answer:
B 144.0 s is the best answer of this question
Answer: E. none of these
Explanation: because the f-block element is n-2
TBH i dont know but can you give advice to get more points on this site
Answer:



Explanation:
Molar mass of NaCl = 58.44 g/mol
Mass of NaCl = 195 g
Volume of solution = 4.05 L
Molarity of solution is

The molarity of the solution is 
Moles of NaCl = 4.63 mol
Volume is given by

The volume of the solution that contains the required amount NaCl is 
Volume of solution = 
Moles of solution is given by

The number of moles of NaCl is
.