5.2 g of HCl are dissolved in 25 mL of solution. What is the molarity?

The molarity is 5.7 moles per dm^3

Explanation:

Molarity is calculated in units of moles per dm^3 or simply moles per liter.

What this means is that to get the molarity, we simply find the number of moles and divide by the volume.

Since we are given the mass, we need to find the number of moles first.

Mathematically, the number of moles = mass/molar mass

The molar mass of HCl is 1 + 35.5 = 36.5 g/mol

The number of moles contained in 5.2g of HCl = 5.2/36.5 = 0.1425 moles

Now, we also need to convert the the volume to liters too.

1000 ml = 1L

25ml = xL

x * 1000 = 25

x = 25/1000 = 0.025 L

the molarity is thus 0.1425/0.025 = 5.7 mol/dm^3

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