If 6.5g of zinc react with 5.0g of Hcl according to reactant zn + 2hcl zncl2 +h2
What gram of that reactant remains unreacted
To determine the grams of reactant remaining unreacted, we need to first determine the limiting reactant in the reaction.
1. Convert the grams of zinc to moles:
Mass of zinc = 6.5g
Molar mass of zinc (Zn) = 65.38 g/mol
Number of moles of zinc = Mass of zinc / Molar mass of zinc
Number of moles of zinc = 6.5g / 65.38 g/mol = 0.0994 mol
2. Convert the grams of HCl to moles:
Mass of HCl = 5.0g
Molar mass of HCl = 36.461 g/mol
Number of moles of HCl = Mass of HCl / Molar mass of HCl
Number of moles of HCl = 5.0g / 36.461 g/mol = 0.137 mol
3. Determine the stoichiometric ratio between zinc and HCl:
From the balanced equation, we can see that the ratio between zinc and HCl is 1:2. This means that 1 mole of zinc reacts with 2 moles of HCl.
4. Calculate the moles of HCl required to react with the given moles of zinc:
Required moles of HCl = 2 * Number of moles of zinc
Required moles of HCl = 2 * 0.0994 mol = 0.1988 mol
Now, we can compare the actual moles of HCl (0.137 mol) to the required moles of HCl (0.1988 mol) to determine the limiting reactant.
Since the actual moles of HCl are less than the required moles of HCl, HCl is the limiting reactant in this reaction.
To find the grams of unreacted zinc, we can use the remaining moles of HCl and the stoichiometric ratio:
5. Calculate the moles of zinc reacted:
Moles of zinc reacted = (Number of moles of HCl * 1 mole of zinc) / 2 moles of HCl
Moles of zinc reacted = (0.137 mol * 1 mol) / 2 mol = 0.0685 mol
6. Calculate the moles of zinc remaining unreacted:
Moles of zinc remaining unreacted = Number of moles of zinc - Moles of zinc reacted
Moles of zinc remaining unreacted = 0.0994 mol - 0.0685 mol = 0.0309 mol
7. Convert the moles of zinc remaining unreacted to grams:
Mass of zinc remaining unreacted = Moles of zinc remaining unreacted * Molar mass of zinc
Mass of zinc remaining unreacted = 0.0309 mol * 65.38 g/mol = 2.02g
Therefore, there are 2.02 grams of zinc remaining unreacted.