Answer:
An aquifer is a layer of porous substrate that contains and transmits groundwater. ... The upper level of this saturated layer of an unconfined aquifer is called the water table or phreatic surface. Below the water table, where in general all pore spaces are saturated with water, is the phreatic zone.
Answer:
2.3*10^-19 M/s
Explanation:
Generally, reaction rate is the product of the rate constant, and the concentrations of the reactants in the system. Therefore, the rate of the reaction can be expressed as:
rate = k*![[CF_{3}CH_{2}F][OH]](https://tex.z-dn.net/?f=%5BCF_%7B3%7DCH_%7B2%7DF%5D%5BOH%5D)
The value of the rate constant k is 1.6*10^8 [1/(M*s)] at the given temperature.
![[CF_{3}CH_{2}F]](https://tex.z-dn.net/?f=%5BCF_%7B3%7DCH_%7B2%7DF%5D)
= 6.3*10^8 molecules/cm^3
![[OH]](https://tex.z-dn.net/?f=%5BOH%5D)
= 8.1*10^5 molecules/cm^3.
However, we need to convert to mol/(L(M). Therefore:
6.3*10^8 *(1000/6.023*10^23) = 1.05*10^-12
8.1*10^5 molecules/cm^3 *(1000/6.023*10^23) = 1.3*10^-15
Thus:
rate =k* = 1.6*10^8* 1.05*10^-12* 1.3*10^-15 =2.3*10^-19 M/s
1.a) All except copper can react with dilute sulphuric acid.
REACTION OF DILUTE SULPHURIC ACID WITH COPPER (II) CARBONATE
CuCO3 (s) + H2S04 (aq)———> CuSO4(aq) +CO2(g)+ H2O (l)
REACTION OF COPPER (II) OXIDE WITH DILUTE SULPHURIC ACID
CuO (s) + H2SO4 (aq)———> CuSO4 (aq) + 2H2O (l)
Can you translate in english i can’t understand this
Answer:
Mass = 547.02 × 10⁻²³g
Explanation:
Given data:
Number of atoms of Al = 122 atom
Mass in gram = ?
Solution:
Avogadro number:
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.
1 mole = 6.022 × 10²³ atoms
122 atom/6.022 × 10²³ atoms × 1 mol
20.26× 10⁻²³ mol
Mass in gram:
Mass = number of moles × molar mass
Mass = 20.26× 10⁻²³ mol × 27 g/mol
Mass = 547.02 × 10⁻²³g
