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matrenka [14]
3 years ago
15

State the difference between mass and weight

Chemistry
1 answer:
Mkey [24]3 years ago
8 0

Answer:

Mass is the measurement of what amount of matter is contained in an object. Whereas

weight is the measurement the pull of gravity on an object.

Another way to differentiate both is Mass is measured on a balance comparing a known amount a matter of to an unknown amount of matter and weight is measured on a scale.

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A scientist measures the standard enthalpy change for the following reaction to be 81.1 kJ :2CO2(g) + 5 H2(g)C2H2(g) + 4 H2O(g)B
posledela

<u>Answer:</u> The enthalpy of the formation of CO_2(g) is coming out to be -410.8 kJ/mol.Z

<u>Explanation:</u>

Enthalpy change is defined as the difference in enthalpies of all the product and the reactants each multiplied with their respective number of moles. It is represented as \Delta H^o

The equation used to calculate enthalpy change is of a reaction is:  

\Delta H^o_{rxn}=\sum [n\times \Delta H^o_f(product)]-\sum [n\times \Delta H^o_f(reactant)]

For the given chemical reaction:

2CO_2(g)+5H_2(g)\rightarrow C_2H_2(g)+4H_2O(g)

The equation for the enthalpy change of the above reaction is:

\Delta H^o_{rxn}=[(1\times \Delta H^o_f_{(C_2H_2(g))})+(4\times \Delta H^o_f_{(H_2O(g))})]-[(2\times \Delta H^o_f_{(CO_2(g))})+(5\times \Delta H^o_f_{(H_2(g))})]

We are given:

\Delta H^o_f_{(H_2O(g))}=-241.8kJ/mol\\\Delta H^o_f_{(H_2(g))}=0kJ/mol\\\Delta H^o_f_{(C_2H_2(g))}=226.7kJ/mol\\\Delta H^o_{rxn}=81.1kJ

Putting values in above equation, we get:

81.1=[(1\times (226.7)})+(4\times (-241.8))]-[(2\times \Delta H^o_f_{(CO_2(g))})+(5\times (0))]\\\\\Delta H^o_f_{(CO_2(g))}=-410.8kJ/mol

Hence, the enthalpy of the formation of CO_2(g) is coming out to be -410.8 kJ/mol.

8 0
3 years ago
How are the appearances of lithium, sodium and potassium similar?
Svetlanka [38]
They are all metals that share common structures and similar properties that meant them appear identical to one another
7 0
2 years ago
True or false applied chemistry does not have a specific goal or application
melisa1 [442]

Answer:

False. The goal of chemistry is to accumulate knowledge. Sometimes true. Biochemistry involves ... Sometimes true. Applied Chemistry is used to attain specific goals ... Applied Chemistry.

Explanation:

I really hope this helped :)

7 0
3 years ago
Even about the food chain is correct?​
kap26 [50]

Answer:

its C, because the cocunut tree gets energy from the sun and makes it into cocunut that is true

Explanation:

its C, because the cocunut tree gets energy from the sun and makes it into cocunut that is true

8 0
3 years ago
Brainliest
erik [133]

Answer:

Plastic is an insulator

Explanation:

This enables you to touch it without burning yourself because it does not conduct heat easily.

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