Answer:
3.01×10²⁴ molecules of H₂
Explanation:
Reaction that can produce hydrogen gas from Pb can be this:
Pb + H₂S → PbS + H₂
1 mol of Pb can react to 1 mol of H₂S to produce 1 mol of PbS and 1 mol of H₂
Ratio is always 1:1.
In conclussion 5 moles of lead will produce 5 moles of H₂.
Let's apply the NA to count molecules
1 mol contains 6.02×10²³
Then, 5 moles must contain (5 . 6.02×10²³) = 3.01×10²⁴ molecules
1- mole of any Substance will have the same number of Molecules.
Molecular weight of CO2= 44
Molecular weight of H20= 18
So 18 g of H20 will contain the same Number of molecules as in 44 g of CO2.
Therefore 7.2 g of H2O will have same Number of Moleculesas in =7.2/18 x 44
= 17.6 g of CO2.
On the other hand ammonia is a very dangerous chemical which has a pungent smell and effect the eyes of the user. Thus it kept always in the fume exhaust hood for storing and dispensing function.
The pH of ammonia buffer contains ammonium hydroxide (NH₄OH) and a salt of ammonia with a strong acid like (HCl) which produces, ammonium chloride (NH₄Cl) mixture. The evaporation rate of ammonia is so high at room temperature thus on opening of the buffer solution the ammonia get evaporated very fast and the concentration of ammonia decreases which affect the pH of the buffer solution.
Thus the reason to put ammonia buffer in fume hood is explained.
Answer:
Se llaman bioelementos primarios. Los átomos de carbono tienen la capacidad de unirse a otros átomos. Esto permite que tenga lugar la vida y es por eso que el carbono es el bioelemento más importante. Otros elementos químicos se encuentran en los seres vivos; sin embargo, aparecen en pequeñas cantidades.
Explanation:
The molecules move faster