a candle was 27.9 grams. the mass of the candle that burned in 3 minutes was 7.2 grams.
a) How many moles of wax were in the candle before it burned ?
b) How many molecules are in the candle before it burned?
c) How many moles of wax were used up during the burning?
d) How many molecules were used up during the burning?
e) How long would it take to burn 1 mole of candle?
You need to show some kind of work OR explain in detail exactly what you don't understand.
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To answer these questions, we need to understand the concept of moles, molar mass, and Avogadro's number. Let's break down the steps to find the answers:
Step 1: Calculate the molar mass
First, we need to calculate the molar mass of the wax. The molar mass represents the mass of one mole of a substance. In this case, we need to find the molar mass of the wax.
Step 2: Calculate the number of moles
To find the number of moles of wax in the candle before it burned, we divide the mass of the candle by its molar mass.
Step 3: Calculate the number of molecules
To calculate the number of molecules, we will use Avogadro's number, which is 6.022 x 10^23. One mole of any substance contains this many molecules.
Step 4: Calculate the moles used up during the burning
To find the moles of wax used up during the burning, we subtract the mass of the burned wax from the original mass of the candle and divide by the molar mass.
Step 5: Calculate the number of molecules used up
To calculate the number of molecules used up, we multiply the moles used up during burning by Avogadro's number.
Now, let's calculate each part step-by-step:
a) How many moles of wax were in the candle before it burned?
Step 1: Molar mass of wax
To determine the molar mass of the wax, you need to know the chemical formula of the wax. Depending on the composition of the wax, the molar mass will differ. If you can provide the chemical formula or composition of the wax, we can proceed to calculate the molar mass.
b) How many molecules are in the candle before it burned?
We can calculate the number of moles of wax in the candle using the formula determined in part a, and then multiply it by Avogadro's number (6.022 x 10^23) to find the number of molecules.
c) How many moles of wax were used up during the burning?
We can calculate the moles of wax used up by subtracting the mass of the burned wax from the original mass of the candle and dividing it by the molar mass determined in part a.
d) How many molecules were used up during the burning?
To find the number of molecules used up, we multiply the moles used up during burning (calculated in part c) by Avogadro's number (6.022 x 10^23).
e) How long would it take to burn 1 mole of candle?
The time it takes to burn one mole of candle may depend on various factors, such as the burning rate or the specific candle being used. Without additional information, it is difficult to provide an accurate estimate.
how do you turn grams into moles/molecules?
mols = grams/molar mass
mols = #molecules/6.022E23