Question

8. A 50-g/L solution was diluted 1:5. This diluted sam ple was then diluted 1:10. What is the concentration of the final solution? a. 0.8 g/L b. 1 g/L c. 2.9 g/L d. 3.3 g/L 9. How much diluent is needed to prepare 300 mL of a 0.2-M working solution from a 0.8-M stock solution? a. 75 mL b. 225 ml c. 900 mL d. 1200 mL 10. What is the molarity of a solution containing 2 mol of sodium in 400 mL of water? Na a. 0.005 M b. 0.5M C. SM d. SOM 11. How many moles of glucose are in 300 mL of a 2-M glucose solution? a. 0.6 b. 6 c. 60 d. 600

Answer 1

In dilution volume of solution moreases and molarity decreases Initial Concentration = 50gm diluted to IS concentration = = 10 m/u diluted to 1:10 concentration = logmu to = 1 gml it Apwe know, mole of beth and dilutent are none 3oond 0. 2m = 0.8m xų V₂ = 300x 0.2 0.9 m V₂ = 75ml Molarity = Mole of nolute volume of nolution in litre = 2mot 2 mot 400 ml - zmos 2 mo o Tere u 2010 yoo m= 5m

O Molarity = Mole of dute volume of adution more of glucose 3 come en litre 2m = mole of glucose = 2m x 300ml = 2m x 1300 Jet = 0.6 mode lovo
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