Interpretation Introduction To determine: The number of moles of H 2 O per mole of Na 2 CO 3 . xH 2 O . Explanation Given: The chemical formula of washing soda is Na 2 CO 3 . xH 2 O , Where, x is the number of moles of H 2 O (water) per mole of Na 2 CO 3 . Initial mass of sample, before heating is 2.558 g . Final mass of sample, after heating is 0.948 g . After heating, the water gets hydrated and only Na 2 CO 3 is left behind. Hence, the mass of Na 2 CO 3 formed is 0.948 g . Formula The mass of water present in the sample can be calculated by using the formula, Mass of water = ( Mass of sample before heating − mass of sample after heating ) Substitute the given values of the initial and final mass of the sample in the above expression, Mass of water = ( 2 .558 − 0 .948 ) g = 1 .61 g The atomic mass of hydrogen atom is 1 g . The atomic mass of oxygen atom is 16 g . The atomic mass of sodium atom is 23 g . The atomic mass of carbon atom is 12 g

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Author: Brown

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Chapter 3, Problem 59E

Interpretation Introduction

To determine: The number of moles of H2O per mole of Na2CO3.xH2O .

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Chapter 3, Problem 58E

Chapter 3, Problem 60E

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