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4 years ago

9

Use your periodic table to identify the name for each element in a compound

1 answer:

Elden [556K]4 years ago

3 0

... where is the image??

Here is an example though:
If you were given NaCl (this is he chemical formulafor table salt) you could identify Na (first column, or group, on your periodic table (PT) and 2nd row, or period, on your PT) as sodium.
The Cl you could identify as Chloride.

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3 years ago

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Calculate the change in entropy that occurs in the system when 4.20 mole of diethyl ether (\(\rm C_4H_6O\)) condenses from a gas

anyanavicka [17]

Answer : The entropy change of the system is, 361.83 J/K

Solution :

Formula used :

$\Delta S=\frac{n\times \Delta H_{vap}}{T_b}$

where,

$\Delta S$ = entropy change of the system = ?

$\Delta H$ = enthalpy of vaporization = 34.6 kJ/mole

n = number of moles of diethyl ether = 4.20 mole

$T_b$ = normal boiling point = $26.5^oC=273+26.5=307.6K$

Now put all the given values in the above formula, we get the entropy change of the system.

$\Delta S=\frac{4.20mole\times (34.6KJ/mole)}{307.6K}=0.36183kJ/K=0.36183\times 1000=361.83J/K$

Therefore, the entropy change of the system is, 361.83 J/K

4 0

3 years ago