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To determine which solutions have the same concentration, we need to calculate the molarity of each solution.
Molarity (MM) is defined as the number of moles of solute per liter of solution. However, the given amounts are not in moles or liters, so we first need to convert them to moles and liters, respectively.
Given: (a) 20 g20g of NaOHNaOH in 200 mL200mL of solution (b) 0.5 mol0.5mol of KClKCl in 200 mL200mL of solution (c) 40 g40g of NaOHNaOH in 100 mL100mL of solution (d) 20 g20g of KOHKOH in 200 mL200mL of solution
Let's calculate the molarity of each solution:
(a) For NaOHNaOH:
(b) For KClKCl:
(c) For NaOHNaOH:
(d) For KOHKOH:
Comparing the molarities, we can see that option (a) and option (d) have the same molarity of 2.5 M2.5M.
So, the correct answer is:
(a) 20 g of NaOH in 200 mL of solution and (d) 20 g of KOH in 200 mL of solution
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