Tutorial for Ray Only

Item number 3 Formula Mass Computations (in amu) – Table 1

KCl

K = 39.098 Cl = 35.453

Mr = 39.098 + 35.453 = 74.551 amu

H2O

H = 1.008 O = 15.999

Mr = 2(1.008) + 15.999 = 18.02 amu

CaSO4

Ca = 40.078 S = 32.065 O = 15.999

Mr = 40.078 + 32.065 + 4(15.999) = 136.14 amu

NH3

N = 14.007 H = 1.008

Mr = 14.007 + 3(1.008) = 17.03 amu

Hg (NO3) 2

Hg = 200.59 N = 14.007 O = 15.999

Mr = 200.59 + 2[14.007 + 3(15.999)] = 324.60 amu