chemistry.

The relative mass of aluminum chloride is 267 and its composition by mass is 20,3% Al and 79,7% chlorine. Determine the empirical and molecular formulas of Aluminum chloride.

  1. 👍
  2. 👎
  3. 👁
  1. Take a 100 g sample.
    This will give you 20.3 g Al and 79.7 g Cl. Convert each of these grams into moles.
    moles Al = 20.3/atomic mass Al
    moles Cl = 79.7/atomic mass Cl.

    Now find the ratio, in small whole numbers, to equate the two. The easiest way to do that is to divide the smaller number by itself (which assure you it will be 1.000), then divide the other number by the same small number. You should get AlxCly where x and y are small whole numbers. That will give you the empirical formula.
    Then add up the atomic masses to find the mass of the empirical formula, divide into 267 to determine n, round n to a whole number, and multiply by the empirical formula to find the molecular formula. The molecular formula will be (AlxCly)n.

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Science

    An empty relative density bottle has a mass of 25g.When filled with a liquid of relative density 0.92g,its mass became 85g.Calculate the mass of the bottle when full of water.

  2. chemistry

    One mole of aluminum chloride (AlCl3), 26.98 grams of aluminum (Al), and 106.4 grams of chlorine (Cl). What is the percent composition of aluminum in aluminum chloride? A 3.700% B 20.22% C 25.40% D 79.81%

  3. CHEMISTRY

    This is STOICHIOMETRY. Please i need help in the worst way. I don't understand this at all and it is due tomorrow, please i need someones help who really understands this. #1.aluminum nitrite and ammonium chloride react to form

  4. Chemistry

    2Al(s)+3Cl2 = 2AlCl3 Limiting Reactant is Cl with 0.329mol. What is the maximum mass of aluminum chloride that can be formed when reacting 30.0g of aluminum with 35.0g of chlorine?

  1. Chemistry

    Bauxite ore contains aluminum oxide Al2O3(s) which is decomposed using electricity to produce aluminum metal and oxygen gas. What mass of aluminum metal can be procuced from 155g of aluminum oxide?

  2. Chemistry

    Aluminum metal and hydrogen chloride react to form aluminum chloride and hydrogen gas. a.)How many moles of aluminum metal are needed to produce 3.33 moles of aluminum chloride? b.)How many moles of hydrogen chloride are needed to

  3. CHEM-last part prob.

    Aluminum reacts with chlorine gas to form aluminum chloride via the following reaction: 2Al(s) + 3Cl2(g) -> 2AlCl3(s) You are given 19.0g of aluminum and 24.0g of chlorine gas. a)If you had excess chlorine, how many moles of of

  4. Chemistry

    1) A compound has the following percentages by mass: barium, 58.84%; sulfur, 13.74%; oxygen, 27.43%. Determine the empirical formula of the compound. 2) If a 1.271-g sample of aluminum metal is heated on a chlorine gas atmosphere,

  1. Chemistry

    Given that the mean relative atomic mass of chlorine contains two isotopes of mass number 35 and 37 what is the percentage composition of the isotopes of mass number 37

  2. chemistry

    Aluminum nitrate and ammonium chloride react to form alluminum chloride, nitrogen, and water. what mass of aluminum chloride is present after 43.0 g of aluminum nitrate and 43.0 g ammonium chloride have reacted completely? Please

  3. chemistry

    an aluminum cylinder is 10.0 cm in length and has a radius of .25 cm. if the mass of a single atom of aluminum is 4.48X10^-23 calculate the number of aluminum atoms present in the cylinder. the density of aluminum is 2.70 g/cm^3

  4. Ap Chemistry

    a mixture contains only sodium chloride and potassium chloride. a .1586-g sample of the mixture was dissolved in water. it took 22.90 mL of 0.1000 M AgNO3 to completely precipitate all the chloride present. what is the

You can view more similar questions or ask a new question.