How many grams of glucose are in 0.5 mole of glucose? How many grams of glucose

Question

How many grams of glucose are in 0.5 mole of glucose? How many grams of glucose are in 2.5 moles of glucose? How many grams of glucose are in one liter of 2M glucose solution? How many grams of glucose are in one liter of 0.5M glucose solution? HCl is a strong acid and ionizes completely in water. What is the [H^+], [OH^-], and pH of a 0.001M solution of HCl? Assuming complete ionization, what are the [OH^-], [H^+], and pH of a 0.001 M solution ofNaOH? What is the [H^+] of a solution whose pH is 8? What is the [OH^-]?

Explanation / Answer

Solution :-

Q4) mass = moles * molar mass

Grams of glucose = 0.5 mol * 180.15 g per mol

                                  = 90.075 g glucose

Q5) mass = moles * molar mass

Grams of glucose = 2.5 mol * 180.15 g per mol

                                  = 450.4 g glucose

Q6) 2M glucose solution means 2 mole of glucose in 1 L solution

So mass of glucose = 2 mol * 180.15 g per mol = 360.3 g glucose

Q7) 0.5 M solution means 0.5 mol glucose in 1 L solution

So mass of glucose = 0.5 mol * 180.15 g per mol = 90.075 g glucose

Q8) 0.005 M HCl will give 0.001 M H+

So the pH = -log [H+]

                  = -log [0.001]

                  = 3.0

Q9) 0.001 M NaOH will give 0.001 M OH-

So

pOH = -log [OH-]

pOH= -log [0.001]

pOH = 3.0

pH + pOH = 14

pH= 14 – pOH

pH= 14 – 3.0

pH= 11

Q10)

pH= 8

therefore

pOH = 14 – pH

pOH = 14-8

pOH = 6

[H+] = antilog [-pH]

        =antilog [-8]

        = 1*10^-8 M

[OH-] = antilog [-pOH]

          = antilog [-6]

          = 1*10^-6 M

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