Calculate the molarity ( M ) of these solutions. (a) 45.9 g of NaOHdissolved in

Question

Calculate the molarity (M) of these solutions. (a) 45.9 g of NaOHdissolved in enough water to form 0.516 Lof solution
_____________ 1 M
(b) 12.9 g ofC6H12O6 (dextrose) dissolved inenough water to form 0.276 L ofsolution
______________ M

(c) 22.5 g of urea(NH2CONH2) dissolved in enough water to form105.0 mL of solution
______________ M
Calculate the molarity (M) of these solutions. (a) 45.9 g of NaOHdissolved in enough water to form 0.516 Lof solution
_____________ 1 M
(b) 12.9 g ofC6H12O6 (dextrose) dissolved inenough water to form 0.276 L ofsolution
______________ M

(c) 22.5 g of urea(NH2CONH2) dissolved in enough water to form105.0 mL of solution
______________ M
(a) 45.9 g of NaOHdissolved in enough water to form 0.516 Lof solution
_____________ 1 M
(b) 12.9 g ofC6H12O6 (dextrose) dissolved inenough water to form 0.276 L ofsolution
______________ M

(c) 22.5 g of urea(NH2CONH2) dissolved in enough water to form105.0 mL of solution
______________ M

Explanation / Answer

(a) n(NaOH) = m/M = 45.9/39.998 = 1.1475mol c(NaOH) = n/v = 1.1475/0.516 = 2.22M (b) n(dextrose) = m/M = 12.9/180.156 = 0.0716mol c(dextrose) = n/v = 0.0716/0.276 = 0.259M (c) n(urea) = m/M = 22.5/60.062 = 0.3746mol c(urea) = n/v = 0.3746/0.105 = 3.57M Hope this helps!

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