The atomic mass is the average of the isotopes of the element meaning most averages of isotopes will not be whole numbers
Sodium, Atomic mass: 22.989769 g
You can see in a periodic table
Non metals and metollids in periodic tables are the same how this helps ;)
Answer:
The mass of this 25 mL supercritical CO2 sample has a mass of 11.7g
Explanation:
Step 1: Given data
The supercritical CO2 has a density of 0.469 g/cm³ (or 0.469 g/mL)
The sample hasa volume of 25.0 mL
Step 2: Calculating mass of the sample
The density is the mass per amount of volume
0.469g/cm³ = 0.469g/ml
The mass for a sample of 25.0 mL = 0.469g/mL * 25.0 mL = 11.725g ≈ 11.7g
The mass of this 25 mL supercritical CO2 sample has a mass of 11.7g
Http://water.ky.gov/groundwater/Pages/GroundwaterAwareness.aspx
