How many milliliters of a 2.00 M KBr are needed to prepare 250.0 mL of 0.60 M KBr?
Answers
Answer:
75mL
Explanation:
Data obtained from the question include:
C1 = 2M
V1 =?
C2 = 0.60M
V2 = 250mL
The original volume of solution can be obtained as follows:
C1V1 = C2V2
2 x V1 = 0.6 x 250
Divide both side by 2
V1 = (0.6 x 250) / 2
V1 = 75mL
The volume needed is 75mL
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Answer:
V = 134.5 L
Explanation:
Given data:
Number of moles of KClO₃ = 4 mol
Litters of oxygen produced at STP = ?
Solution:
Chemical equation:
2KClO₃ → 2KCl + 3O₂
Now we will compare the moles of KClO₃ with oxygen.
KClO₃ : O₂
2 : 3
4 ; 3/2×4 = 6 mol
Litters of oxygen at STP:
PV = nRT
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V = 6 mol × 0.0821 atm.L/mol.K × 273 K / 1atm
V = 134.5 L / 1
V = 134.5 L
Answers
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Answers
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The standard units of measurement are particularly important to scientists because they make the result more accurate and precise.
What are accuracy and precision?
When the average value of the different measurements is similar to the correct value then the measurement is said to be accurate and the phenomenon is said to be accurate.
When the values of measurement are close to each other then the result is said to be precise and the phenomena are said to be precise and need to do for the better accuracy of results.
Therefore, they make the result more accurate and precise.The standard units of measurement are particularly important to scientists.
Learn more about accuracy and precision, here:
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Answer:
Explanation: The standred units of measurments are important to scientists because they are the same measurments that all scientist take to make sure that they all have the correct results.