Indirect Gravimetric Determination Partner Data Unknowe ID Code Mass of crucible

Question

Indirect Gravimetric Determination Partner Data Unknowe ID Code Mass of crucible Mass of crucible and mixture 1 25 3.3962 22.4 s22 Mass of mixture Mass of crucible after Ist heating 22 4505g Mass of crucible after 2nd heating Mass of crucible after 3rd hcating NA (If necded) In the items below, be sure to show calculations What mass of water was lost by the sample? Mass Cruci Lle and Mixfve 26silo Mass of Crmbe2 Mixtwe 8.02 What is the molar mass of water? How many moles of water were lost by the sample? , I 9 89 m6les SO2 How many moles of CuCl2·2H2O were present in the original sample?

Explanation / Answer

Mass of water lost = (weight of mixture + Weight of crucible) - weight after hearing

Mass of water lost by the sample = (22.6511 - 22.4522) g = 0.1989 g

Molar mass of water = 18.02 g/mol

Moles of water lost by the sample = 0.1989 g / 18.02 g/mol = 0.01104 mol

Mass of CuCl2 . 2 H2O = 3.3962 g

Molar mass of CuCl2 . 2 H2O = 170.48 g/mol

Number of moles of CuCl2. 2 H2O present = (3.3962 g / 170.48 g/mol) = 0.02 mol

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