Do 80g 15% roztworu H2SO4 dodano 20g wody. Jakie jest stężenie otrzymanego roztworu.HELP

c%=ms/mr*100% 15=ms/80*100 15=100ms/80 /*80 1200=100ms /:100 12=ms c%=12/100 *100% c%=1200/100 c%=12%

cp=15% mr=80g mw=20g cp1=? ------------------------------------------------- cp=ms*100%/mr ms=cp*mr/100%=15%*80g/100%=12g mr1=mr+mw=80g+20g=100g cp1=ms*100%/mr1 cp1=12g*100%/100g=12%