Mr of a substance shows how many times the mass of the molecules of a given substance

univerkov | September 19, 2021 | education

Mr of a substance shows how many times the mass of the molecules of a given substance is more than 1/12 of the mass of a carbon atom. Mr is equal to the sum of Ar elements, taking into account their indices.

Mr (H2O)=2*1+16=18
Mr (H2SO4)=2*1+32+4*16=98
Mr (CO2)=1*12+2*16=44
Mr [Ca3(PO4)2]=3*40+2*31+8*16=310

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