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3 years ago

How many grams of magnesium chloride are needed to make 700ml of a 1.4 m solution?

1 answer:

eduard3 years ago

4 0

Molarity is defined as the number of moles of solute in 1 L solution
molarity of MgCl₂ solution to be prepared - 1.4 M
volume of the solution to be prepared - 700 mL
the number of moles of MgCl₂ in 1 L - 1.4 M
therefore 700 mL should contain - 1.4 mol/L x 0.700 L = 0.98 mol
molar mass of MgCl₂ - 95.2 g/mol
mass of MgCl₂ required - 0.98 mol x 95.2 g/mol = 93.3 g
mass of MgCl₂ required is 93.3 g

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Answer:

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Explanation:

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12. A voltaic cell consists of a chromium electrode dipped in a 1.20 M chromium (III) nitrate

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Generally, the equation for the Oxidation and Reduction is mathematically given as

Cr(s) ------------------ Cr+3(aq) + 3e- ] x 2 ...O

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Reaction

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In conclusion

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Ecell = 0.577 V

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