At STP, 1 mol of gas occupies 22.4 L.
mol O2 = 68.5 L * 1 mol/22.4 = 3.06 mol
The answer is that there are 3.06 mol of oxygen gas at STP.
Answer: Galaxy
Explanation: A galaxy is a large system of stars held in place by mutual gravitation.
For the first question:
Valuable ore deposits and gem crystals are often associated
with igneous intrusions. So for this question the correct option is option “d”.
An example like the Pegmatite’s, which are a form of igneous intrusions, is
responsible for the creation of variety of gems like topaz and tourmaline.
For the second question:
For this specific question, option “c” seems to be the
correct option. Weathering, deposition, compaction, cementation are the
possible sequence that leads to the formation of sedimentary rocks.
<span>Strong bases are good electrolytes because they completely "dissociate" in water. </span>
I think its the sea cucumber and sea urchin
but it could be the star too