Number of molecules in 1 dm³ Oxygen = 2.71 x 10²²
<h3>Further explanation</h3>
Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters/mol.
The mole is the number of particles contained in a substance
1 mol = 6.02.10²³
1 dm³ of oxygen = 1 L Oxygen

n=mol=0.045
No = 6.02.10²³

Answer: D
Explanation:
Utilicé traductor de español para responder esta pregunta
Salt + water
Example :
acid base salt water
↓ ↓ ↓ ↓
HCl <span> + NaOH = NaCl + H</span>₂<span>O
</span>Hydrochloric Acid + Sodium Hydroxide = Sodium Chloride + Water
hope this helps!
Find number of moles and divide by volume to get molarity
If you're referring to plants, your answer is the Epidermis.
Hope this helps! :)