What is the product of a positron and electron combining then undergoing annihilation during the pet imaging process? a. two 511
1 answer:
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Answer:
See explanation
Explanation:
A drying tube prevents moisture from contaminating the reactants. The drying tube contains CaCl2 a hygroscopic material whose function is to absorb the moisture so that it does not react with the Grignard reagent. Without the desiccating action of CaCl2, moisture will enter the reaction chamber,contaminating the reactants.
If water reacts with the Grignard reagent, an alkane is formed. The mechanism of this reaction is shown in the image attached. R here represents the alkyl moiety of the Grignard reagent.
<u>Answer:</u>
<u>For a:</u> The amount of heat transferred for the given amount of methanol is 94.6736 kJ.
<u>For b:</u> The mass of methane gas produced will be 10.384 g.
<u>Explanation:</u>
For the given chemical reaction:
- <u>For a:</u>
To calculate the number of moles, we use the equation:
......(1)
Given mass of methanol = 24.0 g
Molar mass of methanol = 32.04 g/mol
Putting values in above equation, we get:
By Stoichiometry of the reaction:
For every 2 moles of methanol, the amount of heat transferred is +252.8 kJ.
So, for every 0.749 moles of methanol, the amount of heat transferred will be =
Hence, the amount of heat transferred for the given amount of methanol is 94.6736 kJ.
- <u>For b:</u>
By Stoichiometry of the reaction:
252.8 kJ of energy is absorbed when 2 moles of methane gas is produced.
So, 82.1 kJ of energy will be absorbed when = of methane gas is produced.
Now, calculating the mass of methane gas from equation 1, we get:
Molar mass of methane gas = 16 g/mol
Moles of methane gas = 0.649 moles
Putting values in equation 1, we get:
Hence, the mass of methane gas produced will be 10.384 g.