Answer:
E = 9.95×10⁻¹⁹ J
Explanation:
Given data:
Wavelength = 2×10⁻⁷ m
Energy of photon = ?
Solution:
Formula:
E = hc/λ
h = 6.63×10⁻³⁴ Js
c = 3×10⁸ m/s
by putting values,
E = 6.63×10⁻³⁴ Js × 3×10⁸ m/s / 2×10⁻⁷ m
E = 19.89×10⁻²⁶Jm / 2×10⁻⁷ m
E = 9.95×10⁻¹⁹ J
Answer:
Explanation:
in a combustion of ethane 2 moles of ethane react with 7 moles of O2
now no of moles in 54 gram of O2=mass/ molar mass
moles =54/32=1.7 moles
if 7 moles of O2 required 2 moles of ethane then 1.7 mole required=?
7 moles of O2=2 moles of C2H6
1.7 moles of O2=1.7*2/7=0.5 moles of C2H6
0.5 moles of C2H6 contain how much grams=?
mass= moles*molar mass=0.5*30=15
Answer:
d. it does all of that and even harms humans to some extent
let me know if its right
Answer:
0.3758moles
Explanation:
moles of kcl = mass of kcl/ molar mass of kcl = 28/74.5 = 0.3758moles
Answer:
Concentration of the first solution: approximately 0.200 mol/L.
Concentration of the diluted solution: approximately 0.0250 mol/L.
Explanation:
Refer to a modern periodic table for relative atomic mass data:
- H: 1.008;
- S: 32.06;
- O: 15.999.
Formula mass of sulfuric acid :
.
Number of moles of in of this substance:
.
Convert cubic centimeters to liters:
.
.
.
Concentration of this solution:
.
While both the volume and the concentration of the solution changes when it is diluted, the number of moles of in this solution will stay the same. Number of moles of in this of concentrated solution:
.
That will be the same as the number of moles of in the diluted solution.
Concentration of this solution after it is diluted to :
.