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Chemistry question i need help with these calculations


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2.I have 2 minutes I despartly need help with this Chemistry question . A 68.1 gram sample of FeCO3 ...

2O was heated thoroughly in a porcelain crucible, until its weight remained constant. After heating, how many grams of the anhydrous compound remained?
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6.I have a question about the reaction of copper (II) oxide and sulfuric acid to form copper sulfate pentahydrate. ...

entahydrate. My students are varying either the mass of the copper oxide or the concentration of the sulfuric acid. They do not have an understanding of any chemistry calculations and only basic knowledge about chemical equations. They should have some knowledge of ionic equations and neutralistions reactions but I need to explain it to them in very basic terms. Without doing any calculations myself I can't explain it to them.
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1.AU MAT 120 Systems of Linear Equations and Inequalities Discussion

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