Chemistry, 03.07.2019 20:00 ratpizza

What is the empirical formula of a compound with 35.94% aluminum and 64.06% sulfur?

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Answer from: jessiegarrison1

Given:

% Al = 35.94

% S = 64.06

To determine:

Empirical formula of a compound with the above composition

Explanation:

Atomic wt of Al = 27 g/mol

Atomic wt of S = 32 g/mol

Based on the given data, for 100 g of the compound: Mass of Al = 35.94 g and mass of S = 64.06 g

# moles of Al = 35.94/27 = 1.331

# moles of S = 64.06/32 = 2.002

Divide by the smallest # moles:

Al = 1.331/1.331 = 1

S = 2.002/1,331 = 1.5 ≅ 2

Empirical formula = AlS₂

Answer from: sarahidan

The empirical formula for the given compound is Al_2S_3

Explanation:

Let us assume that the mass of the compound be 100 grams.

So, the percentage of the elements will be equal to their respective masses.

Mass of aluminium = 35.94 g

Mass of sulfur = 64.06 g

To find the empirical formula for a compound, we follow some steps:

Step 1: Converting the given masses of the elements into moles.

To calculate moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Moles of aluminium = $\frac{35.94g}{27g/mol}=1.33mol$

Moles of sulfur = $\frac{64.06g}{32g/mol}=2mol$

Step 2: Now, dividing each calculated moles by the smallest number of moles, which is 1.33 moles, to calculate the mole ratio of elements.

Mole ratio of aluminium = $\frac{1.33}{1.33}=1$

Mole ratio of sulfur = $\frac{2}{1.33}=1.5$

Step 3: Converting the mole ratio into whole number ratio.

Multiplying both the ratios by 2, to make both the mole ratios to be a whole number.

Mole ratio of aluminium = $1\times 2=2$

Mole ratio of sulfur = $1.5\times 2=3$

Step 4: Writing each mole ratio as the subscripts of the elements to make the empirical formula.

Empirical formula for the given compound is Al_2S_3

Answer from: Quest

Atomicity occurs to prevent updates of the database occurring only partially, which can cause greater problems than rejecting the whole series outright.some are monatomic, diatomic, triatomic etc because it shows the number of atoms. for example, monatomic means it contains only one atom.

Answer from: Quest

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