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Akimi4 [234]
3 years ago
7

Question 4 Solve and report to correct number of significant figure 2.375 + 4.5​

Chemistry
1 answer:
DiKsa [7]3 years ago
8 0

Answer:

6.9 (two sig figs)

Explanation:

2.375 + 4.5 = 6.875 = 6.9

When adding or subtracting, sig figs are determined by the least number of digits past the decimal point.

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How many grams of NaCl do you need to prepare 200 ml of a 5M solution? The molecular weight of NaCl is 58.4 g/mol. Smol 0.2L-1mo
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Answer:

The answer to your question is: 58.4 g of NaCl

Explanation:

Data

Volume = 200 ml = 0.2 l

Concentration = 5M

MW = 58.4 g

mass NaCl = ?

Formula

             Molarity = (# of moles ) / volume

             # of moles = Molarity x volume

             # of moles = 5 x 0.2

             # of moles = 1

              58.4 g ---------------------- 1 mol

              x          ---------------------  1 mol

              x = (1 x 58.4) / 1

             x = 58.4 g of NaCl

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I hope you find this information useful and interesting! Good luck!

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