Atomic Mass of Element X in XCl3 Stoichiometry Problem

  • Thread starter Benzoate
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In summary, the conversation discusses how to determine the atomic mass of element X if given the mass of X in a compound. The method involves calculating the moles of X and using the given mass to determine the formula mass of X.
  • #1
Benzoate
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Homework Statement



What is the atomic mass of element X if 6.08 g XCl3 contains 1.37 g of X

Homework Equations





The Attempt at a Solution



(6.08 g XCl^3)*(1 mol X/107.729 g *XCl3)*(1.37 g X/1 mol X)=.077 g of X

That can't be right , because 1.37 g of X can't be included in the molar mass of XCl3
 
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  • #2
Long time since passed since doing stoichiometry exercises...

Total XCl3 was 6.08, since grams X was 1.37, amount of Cl mass was 4.71 grams.

How many formula units Cl ? 4.71/(35.5);
Ratio of X formula units to Cl formula units = 1/3

How many moles of X ? ((4.71)/(35.5))*(1/3)

Now you have calculated moles of X or formula units of X, and were given grams of X.
Finish the calculation.
 
  • #3
Roco, your answer was correct, but we can't go about handing out complete solutions to homework questions.

Benzoate, to simplify symbolipt's method a wee bit...

Answer this question: If there's 4.71 gms of Cl3 and 1.37 gms of X (in a sample of XCl3), what is the formula mass of X?
 
  • #4
Gokul43201 said:
Roco, your answer was correct, but we can't go about handing out complete solutions to homework questions.

Benzoate, to simplify symbolipt's method a wee bit...

Answer this question: If there's 4.71 gms of Cl3 and 1.37 gms of X (in a sample of XCl3), what is the formula mass of X?
sorry! will comply.
 

What is the atomic mass of element X?

The atomic mass of an element is the average mass of all the isotopes of that element, taking into account their relative abundance in nature. It is measured in atomic mass units (amu) and can be found on the periodic table.

What is stoichiometry?

Stoichiometry is the calculation of the quantities of reactants and products in a chemical reaction based on the laws of conservation of mass and energy. It allows us to predict the amounts of products that will be formed given a certain amount of reactants.

What is the stoichiometric ratio?

The stoichiometric ratio is the ratio of the coefficients of the reactants and products in a balanced chemical equation. It is used to determine the relative amounts of reactants and products in a reaction.

How do you calculate the atomic mass of an element in a compound?

To calculate the atomic mass of an element in a compound, first determine the number of atoms of that element present in the compound. Then, multiply the atomic mass of the element by the number of atoms and add together the masses of all the atoms present in the compound.

What is the relationship between atomic mass and molar mass?

Atomic mass and molar mass are related by Avogadro's number, which is 6.022 x 10^23. Atomic mass is measured in amu, while molar mass is measured in grams per mole. The molar mass of an element is equal to its atomic mass in grams. This allows us to convert between moles and grams in stoichiometry problems.

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