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Q: What is the % of magnesium in magnesium sulfate? ( Answered ,   1 Comment )
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 Subject: What is the % of magnesium in magnesium sulfate? Category: Science > Chemistry Asked by: karon-ga List Price: \$10.00 Posted: 23 Apr 2004 01:08 PDT Expires: 23 May 2004 01:08 PDT Question ID: 334746
 ```The whole question is, weight by weight, what is the % of: magnesium in magnesium sulfate? iron in iron sulphate? potassium in potassium sulfate? zinc in zinc sulphate? manganese in manganese sulfate? Thank you.```
 ```Hi karon, A sulfate (or sulphate) is a compound in which the hydrogen of sulfuric acid is replaced by a metal. Let's start by noting the atomic weights for the elements related to your question: sulfur: 32.1 oxygen: 16.0 magnesium: 24.3 iron: 55.8 potassium: 39.1 zinc: 65.4 manganese: 54.9 We will then calculate the molecular mass for each of the sulfates, and work out the proportion that the metal forms of the total. These calculations assume that you are interested in anhydrous forms. If you are interested in hydrated forms, let me know which hydrated forms you wish me to use. According to the Sargent-Welch website http://sargentwelch.com/category.asp?c=26344 the relevant formulae are: magnesium sulfate: MgSO4. iron sulfate: FeSO4 potassium sulfate: K2SO4 zinc sulfate: ZnSO4 manganese sulfate: MnSO4 Therefore, the proportion of magnesium in magnesium sulfate, weight for weight, is 24.3 / (24.3 + 32.1 + 64) = 20.2% The proportion of iron in iron sulfate, weight for weight, is 55.8 / (55.8 + 32.1 + 64) = 36.7% The proportion of potassium in potassium sulfate, weight for weight, is (39.1 * 2) / ( (39.1 * 2) + 32.1 + 64) = 44.9% The proportion of zinc in zinc sulfate, weight for weight is 65.4 / (65.4 + 32.1 + 64) = 40.5% The proportion of manganese in manganese sulfate, weight for weight, is 54.9 / (54.9 + 32.1 + 64) = 36.4% Please request clarification if this answer does not yet meet your needs. References: Periodic Table - WebElements http://www.webelements.com/webelements/elements/text/periodic-table/comp.html (for the atomic weights) Google Search Strategy: define: sulfate ://www.google.com/search?q=define%3A+sulfate "magnesium in magnesium sulfate OR sulphate" ://www.google.com/search?q=%22magnesium+in+magnesium+sulfate+OR+sulphate%22 "magnesium sulfate OR sulphate" forumula ://www.google.com/search?q=%22magnesium+sulfate+OR+sulphate%22+forumula "iron sulphate OR sulfate" ://www.google.com/search?q=%22iron+sulphate+OR+sulfate%22 "atomic weight" magnesium ://www.google.com/search?q=%22atomic+weight%22+magnesium "potassium sulfate OR sulphate" chemistry formula ://www.google.com/search?q=%22potassium+sulfate+OR+sulphate%22+chemistry+formula Regards, eiffel-ga``` Request for Answer Clarification by karon-ga on 26 Apr 2004 05:13 PDT ```Thank you, Weiffel-ga. For a \$5 tip, could you please confirm to me the weight of each sulfate needed to produce: 78.1 mg of magnesium 131 mg of potassium 9.1 mg of iron 10.2 mg of zinc 9.1 mg of managanese Many thanks``` Clarification of Answer by eiffel-ga on 26 Apr 2004 08:20 PDT ```Hi karon, 78.1 mg of magnesium is contained in 387 mg of MgSO4 131 mg of potassium is contained in 292 mg of K2SO4 9.1 mg of iron is contained in 24.8 mg of FeSO4 10.2 mg of zinc is contained in 25.2 mg of ZnSO4 9.1 mg of managanese is contained in 25.0 mg of MnSO4 Thanks for an interesting question! Regards, eiffel-ga```
 karon-ga rated this answer: and gave an additional tip of: \$5.00 `Thank you, Eiffel.`
 ```Thaks, karon, for the kind comments and tip. eiffel-ga```