Question

calculate the mass of HCl in 25 ml of 0.75 M HCl?​

Answer 1

Given :

• Concentration = 0.75 M
• Volume of solution = 25ml

To find :

Mass of HCl in given solution

Formula used :

• Molarity = Number of mole of solute ÷ Volume of solution (in L)
• Number of mole = mass ÷ molar mass

Additional points :

• Molar mass of HCl = 36.5 g/mol
• 1 L = 1000 ml

Solution :

First of all, we need to find Number of moles in given volume of solution

➝ Number of moles = Molarity × volume of solution ( in L)

➝ Number of moles = (0.75) × (25 ÷ 1000)

➝ Number of moles = 0.001875 moles

Now we need to find , mass of HCl which will contain this much moles

➝ Number of moles = mass ÷ molar mass

➝ Mass = (0.001875) × (36.5)

➝ Mass ≈ 0.0685 grams

➝ Mass = 68.5 mg

ANSWER :

Mass of HCl = 0.0685 grams = 68.5 mg

Answer 2

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• Refer to the attachment ☃️
• Hope it helps