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Percent Composition

This guide provides step-by-step solutions for significant chemistry problems involving molar mass and percent composition. It covers various scenarios, including finding the mass of substances like NaOH, CaCO3, Ba(NO3)2, and sodium oxide, as well as converting grams to moles for those same compounds. Additionally, it explores calculating the percent composition of elements in compounds such as Mg, HgO, CuSO4, and water, detailing the necessary formulas and calculations for accurate results. Perfect for chemistry students seeking clarity on these fundamental concepts.

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Percent Composition

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  1. Percent Composition

  2. HW – Ques. 7.1 Find the mass of each of the following: 0.50 mole of NaOH 4.5 moles of CaCO3 0.25 mole of Ba(NO3)2 3.00 moles of sodium oxide

  3. HW – Ques. 7.2 How many moles are contained in each of the following: 60. grams of NaOH 75 grams of CaCO3 26.1 grams of Ba(NO3)2 310 grams of sodium oxide

  4. HW – Ques. 7.3 If the mass of 0.60 mole of a certain substance is 72 grams, what is the molar mass of the substance? moles = grams molar mass

  5. Formula: % Composition Part Whole X 100% = % Composition

  6. % Composition From Mass There is 8.20g of Mg in 13.60g of MgO. What is the % composition of Mg, and O? Mg  8.20g 13.60g O  5.40g 13.60g 60.3% X 100% = 39.7% X 100% =

  7. % Composition From Mass Hg = 13.2g HgO = 14.2g Hg  13.2g 14.2g O  1.0g 14.2g 93.0% X 100% = 7.04% X 100% =

  8. % Composition From Formula What is the percent composition of water to 2 significant figures? H  2 X 1 = 2 O  1 X 16 = 16 18g/mole H  2g 18g O  16g 18g 11% X 100% = 89% X 100% =

  9. % Composition From Formula CuSO4 Find the percent composition of copper (II) sulfate? Cu  S O  Solve 1st Now Get Answers Cu 64 X100 = 40% 160 1 X 63.5 = 64 S32 X100 = 20% 160 1 X 32.1 = 32 O 64 X100 = 40% 160 4 X 16 = 64 160

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