Определите Массовую долю элемента в следуйщих веществах? KNO3 Ca (H2PO4) 2 Ca3 (PO4) 2

Mr (KNO3)=39+14+(16*3)=101 w (K)=39/101*100=39% w (N)=14/101*100=14% w (O3)=48/101*100=47% Mr (Ca (H2PO4) 2)=40+(2+31+64)*2=234 w (Ca)=40/234*100%=17%w (H2)=2*2/234*100%=2%w (P)=31*2/234*100%=26%w (O4)=64*2/234*100%=55%Mr (Ca3 (PO4) 2)=120+(31+64)*2=310 w (Ca3)=120/310*100%=39%w (P)=31*2/310*100%=20%w (O4)=64*2/310*100%=41%