solution is made by adding 100g of CO2 to enough water to make a liter of solution. What is the molarity of this solution?

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Chemistry

Claire

15 March, 08:23

solution is made by adding 100g of CO2 to enough water to make a liter of solution. What is the molarity of this solution?

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Yair Henry · Answer 1

We know that molarity is equal to the moles of solute/liters of solution. In the problem, they tell us that there is 1 liter of solution, so we have to find how many moles of solute there are. Since they give us the amount of solute in grams, we can use the molar mass of CO₂ to find how many moles there are:

Carbon has a molar mass of 1 2.012 g/mol

Oxygen has a molar mass of 15.999 g/mol. Since there are 2 (which we can see from the subscript), we have to multiply this number by 2. (15.999) (2) = 31.998 g/mol

We can find the total molar mass of CO₂ by adding these two numbers up:

12.012+31.998=44.01 g/mol

We can then use dimensional analysis to find how many moles there are:

100 g CO₂ (1 mol CO₂/44.01 g CO₂)

=2.27 moles of CO₂

Now that we have the moles of solute and liters of solution, we can plug them into our molarity equation:

M = 2.27 moles / 1 liter

M = 2.27 moles/liter