What is the molarity of Li^2C^2O^4 if 5.00g of the compound is dissolved into 500.0 mL of distilled water?
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For future reference, the carat (this character ^) is for writing numbers in the superscript position, not the subscript position. This question is easy, just find the molar mass of the lithium carbonate using your periodic table then divide the number of grams by the grams/mole value you got above. This will tell you how many moles of the compound you have. Molarity is moles per litre, so divide your moles by 0.5L and you will have your answer. Also, are you sure you have the formula correct? Lithium carbonate should be Li2C2O3 not O4.