Question

1)Ce cantitate de oxid de potasiu reactioneaza cu 177grame acid sulfuric de concentratie 49%.Ce cantitate de solutie de acid sulfuric s-a consumat?

Answer 1

C=md/ms*100=>md=C*ms/100=49*177/100=86,73g H2SO4

K2O + H2SO4 => K2SO4 + H2O

94g K2O.................98g H2SO4
xg K2O..................86,73g H2SO4

x=94*86,73/98=83,19g K2O

MK2O=2AK+AO=2*39+16=94g/mol

n=m/M=83,19/94= Calculeaza !

MH2SO4=2AH+AS+4AO=2*1+32+4*16=98g/mol