Question
Asked Nov 8, 2019
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The reaction of WCl6 with Al at ~400 °C gives black crystals of a compound containing only tungsten and chlorine. A sample of this compound, when reduced with hydrogen, gives 0.2232 g of tungsten metal and hydrogen chloride, which is absorbed in water. Titration of the hydrochloric acid thus produced requires 46.2 mL of 0.1051 M NaOH to reach the end point. What is the empirical formula of the black tungsten chloride?

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Expert Answer

Step 1

Given information:

Mass of tungsten metal = 0.2232 g

Volume = 46.2 mL

Concentration of NaOH = 0.1051 M

Step 2

The representation of atoms of a compound in simple whole number ratio is known as empirical formula.

The rules for determining empirical formula is given as follows:

  • Determine the mass of elements in given compound.
  • Calculate number of moles using molar mass of each compound or element.
  • Divide each number of moles by smallest number of mole value calculated in second step.
  • Round the value calculated in step 3 to nearest whole number.
Step 3

Using given mass of tungsten metal number of moles ...

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Given mass Number of moles of tungsten - Molarmass of tungsten 0.2232g 183.84 g/mol =0.0012 mol

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General Chemistry

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