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Calculate the molar mass of NaHCO3(s), Na2CO3(s), and CO2(g) Calculate the number of moles of HCl...

Calculate the molar mass of NaHCO3(s), Na2CO3(s), and CO2(g) Calculate the number of moles of HCl contained in the two volumes of HCl solution (25.0ml and 50.0mL: remember to use the molarity of the solution rather than the molar mass of HCl to find molarity).

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Answer #1

Maolar mass is calculated by adding atomic weights of the constituent atom and multily with the number atoms in case of more than one.

Molar Mass of NaHCO3 = 23 +1 +12+3x16 g/mol= 84 g/mol

Molar mass of Na2CO3 = 2*23+12+3*16 g/mol = 106 g/mol

Moalr mass of CO2 = 12 +2*16 =44 g/mol

Considering the molarity of the given solution of HCl = 1,

So, 1000 ml contains 1 mole.

number of moles in 25 ml solution = 25*1/1000 moles = 0.025 moles.

In 50 ml 1 M HCl solution, moles oh HCl = 50/1000 = 0.050 moles.

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