Chem 010: Chapter#6: Chemical Composition Worksheet 1. How many moles of Fe does

Question

Chem 010: Chapter#6: Chemical Composition Worksheet 1. How many moles of Fe does 25.0 g of Fe present? 2. How many Mg atoms are contained in 5.00 g of Mg? 3. What is mass in grams of one atom of Carbon? 4. What is mass of 0.252 mol of Copper? 5. How many Oxygen atoms are present in 1.00 mol of Oxygen molecule? 6. Calculate molar mass for 1) Calcium hydroxide 2) barium carbonate 7.How many moles of NaOH are there in 1.00 kg of NaOH? 8. When heated in air 1.63 g of Zn reacts with 0.40 g of Oxygen to form zinc oxide. Calculate % composition of the compound formed? 9 Calculate the empirical formula of a compound containing 52.14 % C, 13.12 % H and 34.73 % ? . 10-Calculate the empirical and molecular formulas of a compound that contains 80.0 % C, 20.0 % H, and has a molar mass of 30.00 g. 11. Calculate % composition by mass of these compounds: ZnCl2

Explanation / Answer

1ans:-

We know

Number of moles= given mass in g/ gram atomic mass

= 25/55.85

= 0.447 mole of Fe

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