For a chemical reaction to be non-spontaneous at any temperature, which of the following conditions must be met?

Hi, the given question has some missing part. Complete question is: " For a chemical reaction to be non-spontaneous at any temperature, which of the following conditions must be met?

A. ΔS° > 0, ΔH° > 0

B. ΔS° > 0, ΔH° < 0

C. ΔS° < 0, ΔH° < 0

D. ΔS° < 0, ΔH° > 0

E. All reactions are spontaneous at some temperature."

Option (D) is correct.

Explanation:

We know that,

Where T represents temperature in kelvin scale. Hence it is always positive.

For a non-spontaneous reaction, should be positive.

If then at any T value.

Hence for any value of T if both and are greater than zero.

So, option (D) is correct.

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.