Answer:
The empirical formula is SiBr₂I₂.
Explanation:
We can’t calculate the molecular formula, because we don’t know the molar mass of the compound.
Assume that you have 100 g of the compound.
Then you have 6.360 g Si, 36.18 g Br, and 57.46 g I.
1. Calculate the moles of each element.
Moles of Si = 6.360× 1/28.08 = 0.2265 mol Si
Moles of Br = 36.18 × 1/79.90 = 0.4528 mol Br
Moles of I = 57.46 × 1/126.90 = 0.4449 mol I
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2. Calculate the molar ratios.
Divide all values by the smallest number.
Si: 0.2265/0.2265 = 1
Br: 0.4528/0.2265 = 2.000
I: 0.4449/0.2265 = 1.964
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3. Determine the empirical formula
Round off all numbers to the closest integer.
Si: 1
Br: 2
I: 2
The empirical formula is SiBr₂I₂.
