The concentration of urea in a solution prepared by dissolving 16 g of urea in 39 g of is __________% by mass. The molar mass of urea is 60.0 g/mol??
You don't need to know the molar mass of urea to find the solution's percent concentration by mass, all you need is the mass of urea and the mass of water or the mass of the solution.
This means that the solution's percent concentration by mass is equal to
The answer is rounded to two sig figs.
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To find the concentration of urea in the solution, you first calculate the total mass of the solution (urea + water). Then, you divide the mass of urea by the total mass of the solution and multiply by 100 to get the percentage by mass.
Total mass of solution = mass of urea + mass of water
Total mass of solution = 16 g (urea) + 39 g (water) = 55 g
Percentage by mass of urea = (mass of urea / total mass of solution) * 100
Percentage by mass of urea = (16 g / 55 g) * 100 = 29.1%
So, the concentration of urea in the solution is 29.1% by mass.
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When evaluating a one-sided 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 one-sided 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 one-sided 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 one-sided 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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