In a titration of 0.5 M HCl and an unknown concentration NaOH, 25.0 ml of NaOH was required to completely neutralize 25.0 ml of HCl. What is the concentration of the NaOH?
Answers
moles of H+ = 0.5 M * 0.025 L HCl = 0.0125 moles H+
moles of OH- should be equal to 0.0125 moles, so
0.0125 moles = (x) * 0.025 L NaOH
x is the concentration of NaOH, which we want to find.
x = 0.5 M
The correct answer is C) 0.5 M.
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Answers
Answer:
The time saved on a ten mile trip by traveling at 60 mph instead of 55 mph is 54 seconds
Explanation:
Velocity is a physical quantity that expresses the relationship between the space traveled by an object, the time used for it and its direction. So velocity is the change in position of a body over time:
The mile per hour (mph) is a unit of speed measurement that expresses the number of international miles traveled per hour.
From the definition of speed it can be deduced that the time it takes to travel a certain distance at a constant velocity is:
velocity*time=position
Then, if the position is 10 miles and the velocity is 55 mph:
time=0.1818 hours
If 1 hour is 60 minutes, the time can be expressed as:
time=0.1818 hours*60 minutes= 10.90 minutes
The position is now constant at 10 miles, but the speed is 60 mph. So the time it takes to travel that distance at that speed is:
time=0.166 hours
If 1 hour is 60 minutes, the time can be expressed as:
time=0.166 hours*60 minutes= 10 minutes
To calculate the time you will save, the subtraction of both times obtained is performed:
10.9 minutes - 10 minutes= 0.9 minutes
If 1 minute is 60 seconds, the time can be expressed as:
0.9 minutes*60 seconds= 54 seconds
The time saved on a ten mile trip by traveling at 60 mph instead of 55 mph is 54 seconds
Time = Distance/Rate
for 60 mph
Time = 10 miles/60 mph
= 0.1666 * 60 minutes = 10 minutes
for 55 mph
Time = 10 miles/55 mph
= 0.181818 * 60 minutes = 10.90 minutes
B. proton-electron
C. neutron-electron
D. electron-electron
Answers
Answer:
b
Explanation:
Answers
1-6 has base like properties
8-14 has avid line properties
since this solution has a pH scale of 4.... the solution is basic
Answers
The correct formula for converting Celsius to Kelvin is T(K) = t(°C) + 273.15 and the reverse is t(°C) = T(K) - 273.15. The Kelvin scale, unlike Celsius and Fahrenheit scales, is an absolute temperature scale and starts from absolute zero.
The relationship between the absolute temperature on the Kelvin scale and the Celsius temperature is defined by a simple conversion formula: T(K) = t(°C) + 273.15. This formula expresses the temperature T in Kelvin as the temperature t in Celsius degrees plus 273.15. The reverse conversion, from Kelvin to Celsius, is represented by the formula: t(°C) = T(K) - 273.15. The other equations presented in the question appear to include irrelevant or incorrect elements and are not standard conversions between Celsius and Kelvin.
It's crucial to note that the Kelvin scale, unlike the Celsius and Fahrenheit scales, is an absolute temperature scale based on absolute zero, the theoretically lowest possible temperature. Therefore, there are no negative temperatures in Kelvin. This is one of the many reasons why it is used in scientific and engineering contexts.
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Answer:
T(kelvins)=T(Degree celsius) +273.15
Explanation:
That's all
Answers
2 CH4 + 1 S8 ----> 2 CS2 + 4 H2S
1.50 mol S8 x 2 mol CS2 = 3 mol CS2
1 1 mol S8
Final answer:
The balanced chemical equation is CH4 + 4S8 --> CS2 + 4H2S. The moles of CS2 produced from 1.50 mol S8 will be 1.50 mol.
Explanation:
To balance the chemical equation CH4 + S8 --> CS2 + H2S, we'll start by balancing the sulfur atoms. The balanced equation becomes: CH4 + 4S8 --> CS2 + 4H2S. Now, count the carbon and the hydrogen atoms on both sides. These are balanced successfully, and hence the overall equation is balanced.
Now, let us calculate the moles of CS2 produced from 1.50 mol S8. Using stoichiometry, a ratio derived from the balanced equation, we find that 1 mol of S8 produces 1 mol of CS2. So, 1.50 mol S8 will produce 1.50 mol CS2.
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Answers
Answer: option (3) SrO, with 84.56%
Explanation:
You have to calculate the mass of strontium and the mass of the compound, for each of the four compounds, and compute the percent:
percent of strontium = (mass of strontium / mass of the chemical formula) × 100 %.
These are the atomic masses of the elements that you have to use:
Atomic mass of Sr: 87.62 g/mol
Atomic mass of Cl: 35.453 g/mol
Atomic mass of I: 126.904 g/mol
Atomic mass of O: 15.999 g/mol
Atomic mass of S: 32.065 g/mol
(1) SrCl₂:
i) mass of Sr: 87.62 g/mol
ii) mass of Cl₂: 2×35.453 g/mol = 70.906 g/mol
iii) mass of SrCl₂: 87.62 g/mol + 70.906 g/mol = 158.526 g/mol
iv) Sr % = [87.62 / 158.526 ] × 100 = 55.27%
(2) SrI₂
Following the same procedure:
i) Sr % = [87.62 / (87.62 + 2× 126.904) ] × 100 = 25.66%
(3) SrO
i) Sr % = [87.62 / (87.62 + 15.999) ] × 100 = 84.56%
(4) SrS
i) Sr % = [87.62 / (87.62 + 32.065) ] × 100 = 73.21%