A sample of substance X that has a mass of 326. 0 g releases 4325. 8 cal when it freezes at its freezing point. If substance X h
1 answer:
The molar heat of fusion of X has been 775.6 cal/mol. Thus, option C is correct.
The molar heat of fusion has been defined as the energy absorbed or released by a mole of substance in converting between solid and liquid state.
<h3>Computation for the molar heat of fusion</h3>The given mass of substance X has been, 326 g.
The molar mass of substance X has been 58.45 g/mol.
The moles of sample have been given as:
Thus, the amount of heat absorbed by 5.58 mol of sample has been 4325.8 cal.
The amount of heat absorbed by a mole of sample has been:
The amount of heat absorbed by a mole of sample in meting has been the molar heat of fusion.
Thus, the molar heat of fusion of X has been 775.6 cal/mol. Thus, option C is correct.
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Answer:
SEPARATION SCHEME FOR CATIONS
GIVEN CATIONS :
Step 1: Add of
to the mixture solution
Result : This would cause a precipitate of to be formed
Reaction :
Step 2 : Next is to remove the precipitate and add to the remaining
solution in the presence of of HCl
Result : This would cause a precipitate of to be formed
Reaction :
Step 3: Next remove the precipitate then add of aqueous
, process the solution in a centrifuge,when the
process is done then sort out the precipitate from the solution
Now this precipitate is and the remaining solution
contains
Next take out the precipitate to a different beaker and add HCl
to it this will dissolve it, then add a drop of this will
form a precipitate which will have the color of
blood indicating the presence of
Reaction :
Now the remaining mixture contains
Explanation:
Answer:
Explanation:
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In this case, since the Lewis theory is based on the bonds formation between atoms via the valence electrons, we can verify the chemical formula of the compound formed by strontium and nitrogen by noticing that strontium has two valence electrons as it is in group IIA, for that reason, two nitrogens should be available for bonding. Therefore, since nitrogen is in group VA, it is said that three electrons are required to attain the octet (maximum amount bonded electrons), for that reason, three strontiums are should be available for bonding. In such a way, the formula should be:
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