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100 POINTS PLEASE HELP (PHOTOS INCLUDED)

100 POINTS PLEASE HELP PHOTOS INCLUDED class=
100 POINTS PLEASE HELP PHOTOS INCLUDED class=

Sagot :

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

  • Volume of solution=100mL=0.1mL
  • Molarity=0.7M

[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

  • Volume of solution=5.5L
  • Molarity=0.4M

[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]

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