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Soloha48 [4]
2 years ago
5

Question 7 (5 points)

Chemistry
1 answer:
cupoosta [38]2 years ago
7 0

Answer: 18 g

Explanation:

0.12=\frac{\text{mass of NaCl}}{140}\\\text{mass of NaCl}=(0.12)(140)=16.8 \text{ g}

The option closest to this is <u>18 g</u>

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Molarity = (Mass/ molar mass) x (1/ volume of solution in Litres)

Mass = Molarity x molar mass x  volume of solution in Litres

Molarity of Tris = 100 mM = 0.1 M

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Hence,

mass of Tris = Molarity of Tris x molar mass ofTris x volume of Tris solution

= 0.1 M x 121.1 g/mol x 0.1 L

= 1.211 g

mass of Tris = 1.211 g


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