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Chapter 9 Stoichimetry

# Chapter 9 Stoichimetry - Chapter 9 Stoichimetry atoms mass...

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Chapter 9 Stoichimetry + , atoms mass conserved but not always moles and molecules conserved . Ex If I react 3 mole of H 2 with excess N 2 , how many moles of NH3 will be produced? N ( ) 2 g + 3H ( ) 2 g 2NH ( ) 3 g How many moles of N 2 are needed to completely react with 3 moles of H 2 ? 1 mole N 2 required How man mole of NH 3 will be produced if 5 moles of N 2 reacts with excess H 2 ? 5N 2 + 5H 2 10NH 3 . If if 42 0 g of N 2 reacts with excess H2 how many gram of NH 3 are produced? N ( ) 2 g + 3H ( ) 2 g 2NH ( ) 3 g N 2 . 42 0 g 21 g N 1 mole = . 1 5 moles N 2 x 2 moles NH3 = . 3 00 moles NH 3 14 g 1 mole N2 . 3 00 moles NH 3 x + ( . ) 14 3x1 01 g = . 51 0g NH 3 produced 1 mole NH 3 STEPS IN DOING STOICHOMETRY PROBLEMS . 1 # Find of moles . 2 . use the mole ratio of the 2 substances involved Find moles of the substance you are looking for . 3 . find the grams of the substance you are looking for . . EX How many gram of H2 are neede to completely react with 98 0g of N 2 ? N ( ) 2 g + 3H ( ) 2 g 2NH ( ) 3 g , . 1 98 0 g N 2 1 mole = . 3 5 moles N 2 28g N 2 . . 2 3 5 moles N 2 x 3 moles H 2 = . 10 5 Moles H 2 1 Mole N 2 . . 3 10 5 Moles H 2 . 2 02g H 2 = . 21 2g Of H

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Chapter 9 Stoichimetry - Chapter 9 Stoichimetry atoms mass...

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