Fred mixes a solution using two types of solutions: 0.60 liters containing 10% alcohol and 0.40 liters containing 35% alcohol. W
1 answer:
The alcohol concentration of the mixed solution is 20%
Simplification :
Based on the given condition, formulate :
35% ×0.40 + 0.6 ×10% ÷{ 0.4+0.6}
Calculate the product :
Calculate the sum or difference :
Any fraction with denominator 1 is equal to numerator : 0.2
Multiply a number to both numerator, denominator : 0.2 ×
Calculate the product or quotient :
A fraction with denominator equals to 100 to a percentage 20%.
How do you find the concentration of a mixed solution?
In general when your are mixing two different concentrations together first calculate number of moles for each solution (n=CV ,V-in liter) then add them together it will be total moles,then concentration of mixture will be = total moles / total volume(liter).
Learn more about concentration of alcohol :
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Answer:
0.712 moles of NO₂ are formed.
Explanation:
First, we need to write the balanced equation:
2 N₂O₅(g) ⇄ 4 NO₂(g) + O₂(g)
From the balanced equation, we can see the relationship between the moles of N₂O₅ and the moles of NO₂. Every 2 moles of N₂O₅ that react, 4 moles of NO₂ are formed. Let us apply this relationship to the information given by the problem (0.356 moles of N₂O₅):
Hi there!
Let me know if you have questions about my answer:
6.15 × 10²⁴
Explanation:
To find the number of atoms, divide the mass of calcium (m) by its molar mass (MM). This will give you the number of moles of calcium (n).
Start with a formula
Substitute values from the question
Simplify
Cancel out the units "g"
Number of moles of calcium, with 4 significant figures
Then, multiply the number of moles of calcium (n) by Avogadro's number () to find the number of calcium atoms.
Start with a formula
Substitute values from the question
Simplify
Cancel out the units "mol"
Multiply, leave one extra digit to help round. "4" tells you to round down.
Final answer to 3 significant figures*
*When multiplying and dividing numbers, your final answer will have the same number of significant figures as the number with the least number of significant figures in the question.
40.08 has 4 significant figures. 41.0 has 3 significant figures. So, you want 3 significant figures in your final answer.
I hope this helps!
Learn more about Avogadro's number here:
Check out another answer that uses significant figures: