![]() ![]() nH 2O yields 1.864 g of anhydrous BaSO 4 after treatment with sulfuric acid, calculate n.This means that the HCl reacted with 0.013722 mole of sodium carbonate.Ġ.013722 mol times 105.988 g/mol = 1.4544 gĢ.4723 g / 18.015 g/mol = 0.13724 mol of waterĦ) For every one Na 2CO 3, how many waters are there?Ĭomment: this is one of the three sodium carbonate hydrates that exist. We also assume that no CO 2 dissolves in the water.)Ġ.6039 g / 44.009 g/mol = 0.013722 mol of CO 2ģ) Use the 1:1 molar ratio referenced above: (Also, note that we assume that the gas is pure CO 2 and that there is no water vapor whatsoever. The key is that there is a 1:1 molar ratio between Na 2CO 3 and CO 2. Ignore the water of hydration for a moment. What is the number of water molecules bonded to Na 2CO 3 (value of n)? nH 2O with excess HCl(aq), 0.6039 grams of a gas is given off.Just sayin'.Įxample #3: When you react 3.9267 grams of Na 2CO 3 This is a problem probably crafted so that you cannot look up possible answers via the InterTubez®. Na 2CO 3 -> 0.0304 mol / 0.0304 mol = 1Ĭomment: sodium carbonate forms three hydrates and the above is not one of them. Determine the formula of the hydrate and then write out the name of the hydrate.Ģ) Determine moles of Na 2CO 3 and water: ![]() After heating, the mass of the anhydrous compound is found to be 3.22 g. H 2O -> 8.09 g / 18.015 g/mol = 0.449 molĮxample #2: A hydrate of Na 2CO 3 has a mass of 4.31 g before heating. The original location of this document is here.Įxample #1: A 15.67 g sample of a hydrate of magnesium carbonate was heated, without decomposing the carbonate, to drive off the water. Here's a worksheet with eight hydrate problems, all of which have (hand-written) solutions. Ten problems Calculate empirical formula when given mass data Fifteen problems Calculate empirical formula when given percent composition data A list of all the problems Determine identity of an element from a binary formula and a percent composition Mole Table of Contents Determine identity of an element from a binary formula and mass data ChemTeam: Determine the formula of a hydrate: fifteen examplesĭetermine the formula of a hydrate: fifteen examples ![]()
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