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3 years ago

Name one of the elements that has similar properties with helium

Chemistry

1 answer:

Dvinal [7]3 years ago

4 0

neon and xenon are the elements that has similar properties to helium

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How much heat is released when 27.6 g P C l subscript 3 cools from 83.1 °C to 55.6 °C? (The specific heat of P C l subscript 3 i

Paul [167]

Answer: Thus 663 J of heat is released when 27.6 g $PCl_3$ cools from 83.1 °C to 55.6 °C

Explanation:

The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.

$Q=m\times c\times \Delta T$

Q = Heat released = ?

m = mass of substance = 27.6 g

C = specific heat capacity = $0.874J/g^0C$

Initial temperature= $T_i$ = $83.1^0C$

Final temperature = $T_f$ = $55.6^0c$

Change in temperature , $\Delta T=T_f-T_i=(55.6-83.1)^0C=-27.5^0C$

Putting in the values, we get:

$Q=27.6g\times 0.874J/g^0C\times -27.5^0C=-663J$

As the value of q is negative, it means the heat has been released and it is 663J

7 0

3 years ago

Larger companies often need many workers who do different steps in the transportation process, instead of each member doing all

Ksju [112]

Answer:

WhAt iS iT/

Explanation:

3 0

3 years ago

Given that E°red = -0.40 V for Cd2+/Cd at 25°C, find E° and E for the concentration cell expressed using shorthand notation belo

tensa zangetsu [6.8K]

From the information in the question, the E° and E for the cell is 0.00 V and 0.12 V.

Using the Nernst equation;

Ecell = E°cell - 0.0592/n log Q

We know that E°cell = 0.00 V since the anode and cathode are both made up of cadmium.

Substituting the given values into the Nernst equation;

Ecell = 0.00 V - 0.0592/2 log (1.0 × 10-5 M/0.100 M)

Ecell = 0.00 V - 0.0296 log(1 × 10^-4)

Ecell = 0.12 V

Learn more: brainly.com/question/8646601

3 0

3 years ago

A compound has a molecular formular of C12H24O6.What is the compound's empirical formula

scoundrel [369]

Answer:

The empirical formula for C12 H24 O6 is C2 H4 O.

5 0

4 years ago

Read 2 more answers

When the free-energy change (AG) of a reaction is negative, the reaction is said to be: Endergonic Non spontaneous Spontaneous E

Greeley [361]

Answer:

Spontaneous

Explanation:

For a spontaneous reaction , the value for the change in free energy or gibbs' free energy is negative .

The change in free energy , i.e. , ΔG , denotes the maximum amount of usable energy released , as going from initial state , i.e. , the reactant towards the final state , i.e. , the product .

And , the sign of the ΔG , determines whether the reaction is Spontaneous or non Spontaneous or at equilibrium ,

i.e. ,

ΔG < 0 , the reaction is Spontaneous

ΔG > 0 , the reaction is non Spontaneous

ΔG = 0 , the reaction is at equilibrium

For ,

ΔG < 0 , that the reaction proceed without any energy input , hence , it is Spontaneous in nature .

6 0

3 years ago