Answer:
Explanation:
3.
Knowns: 100mL of solution; concentration of 0.7M
Unknown: number of moles
Equation: number of moles = volume * concentration
Plug and Chug: number of moles = 100/1000 * 0.7 = 0.07 mole
Final Answer: 0.07mole
2.
Knowns: 5.50L of solution; concentration of 0.400M
Unknown: number of moles
Equation: number of moles = volume * concentration
Plug and Chug: number of moles = 5.5 * 0.4 = 2.20 mole
Final Answer: 2.20 mole
Moles of solute be x
#1
[tex]\\ \rm\Rrightarrow Molarity=\dfrac{Moles\:of\:solute}{Volume\:of\'solution}[/tex]
[tex]\\ \rm\Rrightarrow 0.7=\dfrac{x}{0.1}[/tex]
[tex]\\ \rm\Rrightarrow x=0.1(0.7)[/tex]
[tex]\\ \rm\Rrightarrow x=0.07mol[/tex]
#2
Same like before
[tex]\\ \rm\Rrightarrow \dfrac{x}{5.5}=0.4[/tex]
[tex]\\ \rm\Rrightarrow x=5.5(0.4)[/tex]
[tex]\\ \rm\Rrightarrow x=2.20mol[/tex]
