I’m working on a chemistry question and need an explanation to help me understand better.

Question #1 Calculate the molarity of each solution.

30.2 g$g$ of KCl$KCl$ in 0.945 L$L$ of solution

Express your answer using three significant figures.

58.3 g$g$ of C2H6O$C_2{H}_{6}O$ in 3.4 L$L$ of solution

Express your answer using two significant figures.

33.2 mg$mg$ of KI$KI$ in 104 mL$mL$ of solution

Express your answer using three significant figures.

Q#2 Determine the volume of 0.210 M$M$ KOH$KOH$ solution required to neutralize each sample of sulfuric acid. The neutralization reaction is:
H2SO4(aq)+2KOH(aq)?$H_{2}S{O}_4\left(aq\right)+2KOH\left(aq\right)?$ K2SO4(aq)+2H2O(l)

165 mL$mL$ of 0.105 M$M$ H2SO4$H_{2}S{O}_4$

Express your answer using three significant figures.

50 mL$mL$ of 0.105 M$M$ H2SO4$H_{2}S{O}_4$

Express your answer using two significant figures.

Q#3 Consider the reaction:

2K3PO4(aq)+3NiCl2(aq)?Ni3(PO4)2(s)+6KCl(aq)

What volume of 0.205 M$M$ K3PO4$K_{3}P{O}_4$ solution is necessary to completely react with 130 mL$mL$ of 0.0102 M$M$ NiCl2$NiC{l}_2$?

Express your answer to three significant figures.

Q#4 What is the temperature of 0.420 mol$mol$ of gas at a pressure of 1.2 atm$atm$ and a volume of 11.8 L$L$ ?

Express your answer using two significant figures.