3 years ago

In a halocarbon substituent are- 1)metals 2)non-metals 3)Halogens 4)noble gases

Chemistry

1 answer:

AveGali [126]3 years ago

6 0

Answer:

Hey The answer is Halogens

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Number of neutrons = Atomic mass - Atomic number (number of protons)
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4 years ago

The proper name for PCl6 is phosphorus hexachloride. TRUE FALSE

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What is a metorlogist

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How many moles are in 19.4 grams of sodium( Na)?

Vadim26 [7]

Answer:

0.844 mol Na

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3 years ago

When a 21.5-g sample of LiCl was added to 195 g of water at a temperature of 20.00°C in a calorimeter, the temperature increased

Paha777 [63]

Answer:

$63.09KJ/mol$

Explanation:

In this case, to calculate the heat of solution (KJ/mol) we have to take into account the mass of water, the specific heat of the water and the temperature change, so:

$m=195~g$

$c=4.18~J/g^{\circ}C$

Δ $T=39.26^{\circ}C$

With this in mind, we can use the equation:

$Q=m*c*T$

If we plug the values into the equation we will have:

$Q=195~g*4.18~J/g^{\circ}C*39.26^{\circ}C$

$Q=32000.83~J$

Now, with the mass value (21.5 g) and the molar mass of LiCl (42.39g/mol) we can calculate the moles of LiCl:

$21.5~g~LiCl\frac{1~mol~LiCl}{42.39~g~LiCl}=0.507~mol~LiCl$

Now, in the heat of solution, we have KJ/mol units. Therefore, we have to convert from J to KJ:

$32000.83~J\frac{1~KJ}{1000~J}=32~KJ$

Finally, we can divide by the moles of LiCl:

$\frac{32~KJ}{0.507~mol}=63.09KJ/mol$

So, for each mole of LiCl, we have 63.09 KJ involved in the dissolution process.

I hope it helps!

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4 years ago