Question

Find the relative molecular mass of X12Y22Z11 (the atomic mass of X=12,Y=1,Z=16)
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Answer 1

Given molecule: $X_{12} Y_{22} Z_{11}$

Given atomic masses: X = 12u, Y = 1u, Z = 16u

∴Relative molecular mass = 12*12 + 1*22 + 16*11  (∑no. of atoms*atomic mass)

                                           = 144 + 22 + 176

                                           = 342 u