A hydrocarbon is burnt completely to give 3.447g of #sf(CO_2)# and 1.647g of #sf(H_2O)#. What is the empirical formula ?
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I'll demonstrate a different method for determining how many moles of hydrogen and carbon the hydrocarbon sample contained.
This technique makes use of the percentages of carbon and hydrogen in water and carbon dioxide, respectively.
Apply the same principle to hydrogen and water, but remember that each water molecule yields two hydrogen atoms.
Given that 11.21 g of hydrogen will be present in every 100 g of water, your hydrocarbon contained
Now, calculate how many moles of each you have using the molar masses of hydrogen and carbon.
Once more, calculate the mole ratio of carbon to hydrogen in the hydrocarbon by dividing both numbers by the smallest one.
Your sample included
To eliminate the fractional subscript, multiply by three.
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To determine the empirical formula, first, find the moles of carbon dioxide and water produced using their respective molar masses. Then, determine the ratio of the elements (carbon and hydrogen) in the compound using these moles. Finally, express the ratio in the simplest wholenumber ratio to obtain the empirical formula.

Calculate moles of carbon dioxide (CO2):
 Moles of CO2 = mass of CO2 / molar mass of CO2

Calculate moles of water (H2O):
 Moles of H2O = mass of H2O / molar mass of H2O

Determine the ratio of carbon to hydrogen by comparing the moles obtained from steps 1 and 2.

Express the ratio in the simplest wholenumber form to obtain the empirical formula.
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When evaluating a onesided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a onesided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a onesided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a onesided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
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