Idk.... my grade in the school C (about chemistry)
Answer:
4.17 g/mL
Explanation:
In order to determine the density of the solid, we need to know both its mass and its volume.
<em>The mass </em>is already given to us by the problem, 45.0 g.
As for <em>the volume</em>, we can determine it by using <u>Archimedes' principle.</u> It states that the volume of water displaced by an object when submerged is equal to the object's volume.
- Water displaced = 75.8 mL - 65 mL = 10.8 mL
Finally we <u>calculate the density</u> of the solid:
- Density = mass / volume = 45.0 g / 10.8 mL
A. helium, neon and argon, because they are in the same group or column
Using ideal gas equation,
PV=nRT
P=199 kpa
V=4.67 L
T=30+273K= 303K
n= number of moles of gas
R=8.321 L·kPa·K-1·mol-1
So using ideal gas equation,
n=PV/RT
=199*4.67/8.321*303\
=0.37 mol
