Answer to Question #101608 in General Chemistry for Dalha Aisha

Question

Excess concentrated hydrochloric acid was added to 2.0g of potassium tetra oxo manganette (vii) and chlorine gas was evolved and collected as stp the equation of the reaction is below
2 kmno4 +16 HCl = 2 kcl+2 mncl2 +8H2O +5Cl2
1. calculate the number of moles of kmno4 used to prepare chlorine gas
2. The mass of potassium chloride used
3.the volume of chlorine gas produced at stp (k=39, Mn= 55,O=16, Cl=35, H=1 ) Avogadro's constant = 6.02×10^23,gaseous molar volume of stp = 22.4dm^3

Answer 1

1. 2(g)/158(g/mol)=0.01265moles
2. 0.01265moles*74.5(g/mol)=0.942g
3. 0.01265moles/2*5=0.0316mol(Cl2); V(Cl2)=0.0316mol*22.4L/mol=0.707L