A solution of HCL is prepared by dissolving 7.30 gram of hydrogen chloride gas in 100 cm3 of water find the molarity of the solution. If 50.0 cm cube of the solutions is treated with 3. 50 gram of zinc what volume of H2 measured at STP will be evolved.
Answers
Answer:
Molarity of HCl solution is 2.028M.
The volume of Hydrogen gas produced is 1.13568 Liters.
Explanation:
Step 1 : Get the moles of Hydrogen Chloride dissolved in water.
Molar mass of HCl = 1 + 35 = 36 g/mol
Moles = 7.30/36 = 0.2028 moles
There are 0.2028 moles of HCl in 100 cm³.
Step 2: Get the molarity of the solution formed.
Molarity = moles per liter of a solution.
0.2028 moles — > 100 cm³
? — > 1000 cm³
1000/100 × 0.2028 = 2.028 M
Step 3 : Write the equation of the reaction between Zinc and the solution.
Zn + 2HCl —> ZnCl2(aq) + H2(g)
Step 4 : Calculate the moles of HCl in 50 cm³.
50/100 × 0.2028 = 0.1014 moles
Mole ratio of Zinc to HCl = 1 : 2
Moles of Zinc that reacted = 0.1014/2 = 0.0507 moles.
Mole ratio of Zinc to Hydrogen gas :
1 : 1
Moles of hydrogen gas produced is 0.0507 moles.
1 mole of gas at stp = 22.4 Liters.
Volume of hydrogen = 0.0507 × 22.4 = 1.13568 Liters.
The volume of hydrogen gas evolved is 1.13568 Liters.