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Nitella [24]
4 years ago
11

Which of the following represents a compound?

Chemistry
2 answers:
EastWind [94]4 years ago
8 0

Answer:

H₂O

Explanation:

Compound consists of combinations of elements. H (Hydrogen) is an element. O-16 and H-3 are stable isotopes of O (Oxygen) and H (Hydrogen), which are elements. H₂O is compound formed by two elements: Hydrogen and Oxygen.

kifflom [539]4 years ago
6 0

Answer:

B) H2O

Explanation:

Compound is a pure substance composed of two or more different atoms chemically bonded to one another. Among all choices only H₂O is composed of two atoms, and other choices are composed of only one atom.  H₂O is the pure substance composed of chemically bonded two atoms (hydrogen atoms and oxygen atom).

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A reaction will be spontaneous only at low temperatures if both ΔH and ΔS are negative. For a reaction in which ΔH = −310.1 kJ/m
ruslelena [56]

Answer:

3211.12 K

Explanation:

The expression for the standard change in free energy is:

\Delta G=\Delta H-T\times \Delta S

Where,  

\Delta G is the change in the Gibbs free energy.

T is the absolute temperature. (T in kelvins)

\Delta H is the enthalpy change of the reaction.

\Delta S is the change in entropy.

For reaction to be spontaneous, \Delta G

Given, \Delta H=-310.1\ kJ/mol=-310100\ J/mol

\Delta S=-89.00\ J/K.mol

So,

\Delta H-T\times \Delta S

Thus, applying values as:-

-310100-T\times (-89.00)

So, T = 3484.27 K

The conversion of T( °C) to T(K) is shown below:

T( °C)  = T(K) - 273.15  

So,  

T = (3484.27 - 273.15) K = 3211.12 K

<u>The temperature below which the reaction is spontaneous is:- 3211.12 K </u>

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