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estequiometria
Posted: Mon Apr 13, 2020 11:22 am
by Brayan Martinez
A mixture of sodium chlorate and sodium chloride weighing 11.2 g is heated until complete decomposition of sodium chlorate in NaCl and O2 is verified. The NaCl residue weighs 6.8 g. What is the percentage of sodium chloride in the initial mixture? What volume of gas is collected in this reaction if it is at 25ºC and 1atm of pressure?
Posted: Mon Apr 13, 2020 12:53 pm
by ChenBeier
The difference of mass of mixture and total sodium chloride gives mass of oxygen. The volume can be calculated with ideal gas law.
The mole of the oxygen refers to the mole of sodium chlorate and also the mass of it.
The difference of mixture and sodium chlorate gives mass of sodium chloride before.
The division of this mass to mixture guides to the percentage.