Answer:
0.5 mol
Explanation:
Given data:
Number of atoms of He = 3.01 ×10²³
Number of moles = ?
Solution:
Avogadro number:
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.02 × 10²³ is called Avogadro number.
1 mole = 6.02 × 10²³ atoms
3.01 ×10²³ atoms × 1 mol / 6.02 × 10²³ atoms
0.5 mol
C) Humidity.
The amount of water vapor in the air is called humidity. Don't get it confused with relative humidity, its <span>the amount of water vapor present in air expressed as a percentage of the amount needed for saturation at the same temperature.
XD</span>
Answer:
3 cm3
Explanation:
1 L = 1 dm3 = 1000 mL (or 10^3 mL)
1 dm = 10 cm
1 dm3 = 10^3 cm
==> 1 mL = 1 cm3
Therefore, 3 cm3 = 3 mL
