80. (v12c-218-23) Tarkibidagi uglerodning massa ulushi 40% bolgan bir asosli toyingan karbon kislotaning 42 grammidan olinadigan kalsiyli tuzining massasini va undagi kalsiyning massa ulushini toping.
A) 74,9; 0,187 B)45,5; 0,308
C) 65,1; 0,215
D) 55,3; 0,253