If heat energy is transferred from direct contact between a warm object and a cold object, it has been transferred by __________
1 answer:
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<u>Answer:</u> The percent yield of the reaction is 91.8 %
<u>Explanation:</u>
To calculate the number of moles, we use the equation:
.....(1)
- <u>For
:</u>
Given mass of = 4.0 g
Molar mass of = 63.12 g/mol
Putting values in equation 1, we get:
- <u>For oxygen gas:</u>
Given mass of oxygen gas = 10.0 g
Molar mass of oxygen gas = 32 g/mol
Putting values in equation 1, we get:
The chemical equation for the reaction of and oxygen gas follows:
By Stoichiometry of the reaction:
12 moles of oxygen gas reacts with 2 moles of
So, 0.3125 moles of oxygen gas will react with = of
As, given amount of is more than the required amount. So, it is considered as an excess reagent.
Thus, oxygen gas is considered as a limiting reagent because it limits the formation of product.
By Stoichiometry of the reaction:
12 moles of oxygen gas produces 5 moles of
So, 0.3125 moles of oxygen gas will produce = of water
Now, calculating the mass of from equation 1, we get:
Molar mass of = 69.93 g/mol
Moles of = 0.130 moles
Putting values in equation 1, we get:
To calculate the percentage yield of , we use the equation:
Experimental yield of = 8.32 g
Theoretical yield of = 9.052 g
Putting values in above equation, we get:
Hence, the percent yield of the reaction is 91.8 %
Answer:
Option "B" is correct.
Explanation:
According to VSEPR theory, There are repulsion forces exists among the bond pair - bond pair or bond pair - lone pair of electrons. In and
, the number of electron pairs are same but methane has all the four bond pairs where in ammonia, three bond pairs and one lone pair exists. And thus there are repulsion forces possible in between the lone pair and bond pair of electrons thus the arrangement of electron pairs around both the molecules is same or different depending up on the conditions leading to maximum repulsion.