Endothermic and Exothermic Activity
1 answer:
Answer:
Check the explanation
Explanation:
1.
Kindly check the first image for the Synthesis reaction
2.
Kindly check the second image for the Single replacement reaction
3.
Kindly check the second image for the Double displacement reaction
Activation energy Enthalpy change
Synthesis reaction 45 KJ +35 KJ
Single replacement reaction 20KJ -35 KJ
Double replacement 65 KJ +50KJ
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Answer:-
Solution:- From given masses of carbon dioxide and water we could calculate the moles that helps to calculate the moles of C and H.
Molar mass of carbon dioxide = 44 gram per mol
molar mass of water = 18.02 gram per mol
From given info, combustion of compound gives 1.17 grams of water and 2.87 grams of carbon dioxide. Let's calculate the moles of these:
=
Similarly,
=
One mol of water has two moles of H. So, the moles of H would be two times the moles of water as calculated above.
So, moles of H = 2* 0.0649 = 0.1298 mol
One mol of carbon dioxide contains one mol of C. So, the moles of C would be equal to the moles of carbon dioxide calculated above.
moles of C = 0.0652 mol
Let's convert the moles of H and C to grams so that we could calculate the amount of oxygen present in the sample as:
grams of H in sample = 1.008 x 0.1298 = 0.1308 g
grams of C in sample = 12*0.0652 = 0.7824 g
If we subtract the sum of the masses of C and H from sample mass then it would give as the mass of oxygen since the sample has only C, H and O.
mass of O in sample = 3.00g - (0.1308 g + 0.7824 g)
= 3.00 g - 0.9132 g
= 2.0868 g
Let's convert these grams of oxygen to moles on dividing by it's atomic mass as:
= 0.130 mol O
Now, we have the moles of all the three atoms and we know that an empirical formula is the simplest whole number ratio of the moles of atoms. So, let's calculate the ratio. For this, we divide the moles of each by the least one of them.Looking at the moles, the least value is for carbon. So, let's divide the moles of each by the moles of C as:
C = = 1
H = = 2
O = = 2
The ratio of C, H and O is 1:2:2. So, the simplest formula of the compound is .
Based on the trend from the graph, the reaction time would have been 32.5 seconds.
<h3>What is the trend in the graph?</h3>A trend is a general pattern which an observation follows based on previous observations and occurrences.
The reaction time is the time it take for a chemical reaction to occur.
Reaction time is also a measure of reaction rate. The shorter the reaction time, the faster the reaction rate and vice versa.
Based on the trend from the graph, the reaction time would have been 32.5 seconds.
In conclusion, reaction time is a measure of reaction rate.
Learn more about reaction time at: brainly.com/question/24795637
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