1 Honors Chemistry Name _______________________ HW – Hydrates, Percent Composition, EF/MF Date ________________________ Complete these problems on a separate sheet of paper. 1. Determine the percent Oxygen in Potassium Perchlorate. KClO4 Molar Mass is 138.547 g KClO4 4 moles of O in KClO4 Molar mass of O is 15.999 4 moles O = 63.996 g = 63.996 138.547 100 = 46.19 % 2. Determine the percent Aluminum in Aluminum Sulfate. Al2(SO4)3 Molar Mass is 342.15 g 2 moles of Al in Al2(SO4)3 Molar Mass of Al = 26.982 g 2 moles Al = 53.964 g = 53.964 342.15 100 = 15.77 % 3. Determine the percent Iron in Iron II Phosphite. Fe3(PO3)2 Molar Mass is 325.741 g 3 moles of Fe in Fe3(PO3)2 Molar Mass of Fe = 55.933 g 3 moles of Fe = 167.799 g = 167.799 325.741 100 = 51.51% 4. A 4.829 gram sample of Magnesium Sulfate Septahydrate (Epsom Salt). If the sample is heated and all of the water is driven off, how much anhydrous salt will remain? = ! ⋅ 7! ℎ= ! 4.829 ! ⋅ 7! 1 1 ! ⋅ 7! 246.472 ! ⋅ 7! 1 ! 1 ! ⋅ 7! 120.367 ! 1 ! = 2.358 ! 5. A 7.028 gram sample of a sodium sulfate hydrate is heated. After driving off all the water, 3.100 grams of the anhydrous salt is left. What is the formula of the hydrate? = ! ! ⋅ ! ℎ= ! ! ℎ= 3.100 ! ! 1 1 ! ! 142.042 ! ! = 0.02182 ! !
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Honors Chemistry Name...You have a 5.40 gram sample that contains 0.88 grams of hydrogen and 4.52 grams of Carbon. If the molar mass of the compound is 86 grams/mole, what are the
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Honors Chemistry Name _______________________ HW – Hydrates, Percent Composition, EF/MF Date ________________________ Complete these problems on a separate sheet of paper.
1. Determine the percent Oxygen in Potassium Perchlorate. KClO4 Molar Mass is 138.547 g KClO4 4 moles of O in KClO4 Molar mass of O is 15.999 4 moles O = 63.996 g
𝑃𝑒𝑟𝑐𝑒𝑛𝑡 𝐶𝑜𝑚𝑝𝑜𝑠𝑖𝑡𝑖𝑜𝑛 𝑜𝑓 𝑂 = 63.996 𝑔 138.547 𝑔
𝑥 100 = 46.19 %
2. Determine the percent Aluminum in Aluminum Sulfate.
Al2(SO4)3 Molar Mass is 342.15 g 2 moles of Al in Al2(SO4)3 Molar Mass of Al = 26.982 g 2 moles Al = 53.964 g
𝑃𝑒𝑟𝑐𝑒𝑛𝑡 𝐶𝑜𝑚𝑝𝑜𝑠𝑖𝑡𝑖𝑜𝑛 𝑜𝑓 𝐴𝑙 = 53.964 𝑔342.15 𝑔
𝑥 100 = 15.77 %
3. Determine the percent Iron in Iron II Phosphite.
Fe3(PO3)2 Molar Mass is 325.741 g 3 moles of Fe in Fe3(PO3)2 Molar Mass of Fe = 55.933 g 3 moles of Fe = 167.799 g
𝑃𝑒𝑟𝑐𝑒𝑛𝑡 𝐶𝑜𝑚𝑝𝑜𝑠𝑖𝑡𝑖𝑜𝑛 𝑜𝑓 𝐹𝑒 = 167.799 𝑔325.741 𝑔
𝑥 100 = 51.51%
4. A 4.829 gram sample of Magnesium Sulfate Septahydrate (Epsom Salt). If the sample is heated
and all of the water is driven off, how much anhydrous salt will remain?
5. A 7.028 gram sample of a sodium sulfate hydrate is heated. After driving off all the water, 3.100 grams of the anhydrous salt is left. What is the formula of the hydrate?