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5.0 g of sodium hydroxide (molar mass 40 g `mol^(-1)`) is dissolved in little quantity of water and the molarity of the resulting solution?A. 0.1 mol `dm^(-3)`B. 1.0 mol `dm^(-3)`C. 0.125 mol `dm^(-3)`D. 1.25 mol `dm^(-3)` |
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Answer» Correct Answer - D Molarity = `(W_(2)/(M_(2) xxV(dm^(3))))` `=(5g)/(40 g "mol"^(-1) xx V("dm")^(3))` `=1.25 mol dm^(-3)` (`therefore 100 mL = 0.1 L = 0.1 dm^(3))` |
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