CHM110H5 Study Guide - Final Guide: Molar Mass

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CHM110 Tutorial Assignment 1
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1: the following two reactions are observed in the experiment; the h2o and d20 react completely with excess chlorine to create hcl, dcl and o2. The number of moles of the reactants are unknown, so x=the moles of h2o and y=the moles of d20. The same products are then reacted with excess chlorine to produce the second equation: xh2o(aq)+ yd20(aq) +cl2(g) 2xhcl(aq)+2ydcl(aq)+o2(aq) 2xhcl(aq) + 2ydcl(aq) + agno3(aq) agcl(s) +hno3(aq) + dno3(aq) The following two equations can be expressed: the 1st equation represents the mass of h2o plus the mass of d2o is equal to 1. 00g. The 2nd equation represents the moles of agcl equal to the sum of the moles of h20 and d20: (1) 18x + 20y = 1. 00g; (2) 2x + 2y = nagcl. The moles of agcl can be calculated, as you are given the mass: nagcl= 0. 38g/143. 4gmol-1 =2. 6499x10-3 mol.

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