During which stage of sedimentary rock formation do minerals crystallize at points of contact with other clasts?

a. transportation
b. burial
c. deposition
d. cementation

The cementation stage of sedimentary rock formation is the stage where minerals crystallize at points of contact.

D

Explanation

The sedimentary rocks formation consists of five important stages.

The weathering is the process where the rocks were deposited as cluster and the size is reduced either by mechanical or by chemical reactions.

Then the wind or water flow will arrange the small rocks in a layer to form sediments followed by deposition of them as layers.

Then the last two stages compaction and cementation which are combined together and termed as lithography.

The compaction leads to compressing the pores on the surface by the rocks leading to crystallization of the rocks in the small pores of water termed as cementation process of sedimentary rocks.

The water pores in the surface will get filled by the rocks layer as crystallization. This process is termed as cementation.

in the given question, the partial pressure is calculated by using the ideal gas equation, that is, pv = nrt

here, p is pressure, v is volume = 25 l, n is number of moles = 0.0104 moles, r is gas constant = -0.0821 l.atm / mol.k

t is temperature = 273 k

p = nrt / v

p = (0.0104 mol × 0.0821 l.atm / mol.k × 273 k) / 25 l

= 0.0093 atm

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.