Problems (60 points correct (60 points total) Be sure to show your work and give

Question

Problems (60 points correct (60 points total) Be sure to show your work and give answers to number of significant figures and with proper units. Round atomie weights and molar masses to the tenths place. 1. (10 points) Consider a 9.58 g sample of the iodine trioxide 1Os a) How many moles of compound are present in the sample? b) How many grams of iodine are present in the sample? c) How many moles of oxygen atoms are present in the samplet d) How many atoms of iodine are present in the sample? e) How many atoms of oxygen are present in the samplie?

Explanation / Answer

1) (a) Molar mass of IO3= 174.903 g/mol

Therefore number of moles present = Given mass/molar mass = 0.05 mole

(b) Mass of iodine present = 6.95 g

(c) Number of moles of oxygen present = 3/4 x 0.05 mole = 0.0375 mole

(d) Number of atoms of iodine present in the sample = Avogadro number x number of moles of iodine

=3.2981 x 1022

(e) Number of atoms of oxygen present in the sample = Avogadro number x number of moles of iodine

=2.25825 x 1022

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