Answer:
20.5 × 10²³ molecules of He
Explanation:
Given data:
Number of moles of He = 3.40 mol
Number of molecules of He = ?
Solution:
The given problem will solve by using 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 6.022 × 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen
For 3.40 moles of He:
3.40 mol × 6.022 × 10²³ molecules
20.5 × 10²³ molecules of He
2C₃H₆ + 9O₂ ------> 6CO₂ + 6H₂O
moles of C₃H₆ =
=
= 0.995 mol
ratio of C₃H₆ : O₂
2 : 9
∴ mol of O₂ =
= 4.479 mol
Mass of O₂ = (Molar Mass) * (Mole)
= (16 * 2) g/mol * (4.479)mol
= 143.31 g
It speeds up the dissolving of the sugar. Agitation
Chemical reaction: BaCl₂ + H₂O₂ → BaO₂ + 2HCl.
Fresh barium chloride does not contain another substances (impurities) like barium chloride stored in container. Hydrogen peroxide is very reactive and with some cations and anions gives oxygen and water instead of peroxide.