because people didn't have the right equipment to find more... hope this helped
Answer:
i think its B hope this helps :3
Explanation:
Answer:
Explanation:
94.91 nm = 1237.5 / 94.91 eV
= 13.038 eV
Energy of ground state = - 13.6 eV
Energy of higher state to which it jumped
= - 13.6 + 13.038
= - .562 eV
If n be the orbit to which it jumped
13.6 / n² = .562
n = 5 ( approx )
b )
1281 nm = 1237.5 / 1281
= .966 eV
Energy of second photon = 13.038 - .966
= 12.072 eV
Wavelength of second photon
= 1237.5 / 12.072
= 12.51 nm
b ) Energy of intermediate level
= - 0.562 - .966 eV
= - 1.528 eV
If it be n th level
13.6 / n² = 1.528
n = 3
Answer:
Always carry the microscope with two hands. One on the arm and one underneath the base of the microscope.
Answer:
(A) 0.80 M
(B) 0.64 g
(C) 0.050 M
(D) 1.6 M
Explanation:
(A)
Convert 4.0 g to moles with molar mass. Convert 125 mL to L.
4.0 g x (1 mol/39.998 g) = 0.100 mol
125 mL x (1 L/1000 mL) = 0.125 L
Molarity = mol/L
Molarity = 0.100 mol/0.125 L = 0.80 M
(B)
Find moles of NaOH with the molarity you just found. And convert 20 mL to L.
Molarity = mol/L
0.80 M = mol/0.020 L
mol = 0.016
Convert moles to grams with molar mass.
0.016 mol x (39.998 g/1 mol) = 0.64 g
(C)
You know the molarity of a NaOH solution (Part A). 30 mL initial volume and 480 mL final volume are given. Dilution question so use the dilution formula.
M1V1 = M2V2
(0.80 M)(30 mL) = (M2)(480 mL)
M2 = 0.050 M
(D)
Dilution question again, use the dilution formula.
M1V1 = M2V2
(0.80 M)(200 mL) = (M2)(100 mL)
M2 = 1.6 M