# Chapter 2 - Chemical Formulas and Composition Stoichiometrhy - Exercises - Atomic and Weight Formulas - Page 74: 30

(a) $H_{2}S = (2*1.008) + 32.06 = 34.076$ (b) $PCl_{3} = 31 + (3*35.5) = 137.5$ (c) $HCl = 1.008 + 35.5 = 36.508$ (d) $HI = 1.008 + 127 = 128.008$

#### Work Step by Step

Write formula and calculate total weight

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