Ignore this its not the anwser 2.7g
Answer:

Explanation:
Suppose an electron makes transition from n initial (ni) to n final (nf) then formula for wavelength is given by,

Where,
- λ is wavelength of photon
- Rʜ is rydberg constant, the value of Rʜ is
109690 Cm-¹ in <em>Puri Sharma Pathania</em> standard book of physical chemistry &
109737 Cm-¹ according to <em>Wikipedia</em>
- Z is the atomic number of atom, for hydrogen Z =1,
& according to given data, ni = 5, nf = 3
Solution:
Let's solve for wavelength,
Substituting all the given data in above formula,






Now we know that, 1 cm = 10000000 nm,
Converting the wavelength from Cm → Nm




Answer:
Explanation:
Molarity = moles/liters of solution
moles = molarity x Liters of solution
= 0.350 m/L x 0.855 L
= 0.299 mol
mass = moles x molar mass
= 0.299 mol x 102.89 g/ms
= 30.78 grams
Kr 4d10 5s2 5p2 would be your answer.
Answer:
0.003088 moles of hydrogen gas were formed .
Explanation:
Pressure at which hydrogen gas is collected at 20°C = 768.0 Torr
Vapor pressure of water at 20°C = 17.5 Torr
Total pressure = Vapor pressure of water + Partial pressure of hydrogen gas
Partial pressure of hydrogen gas:
Total pressure - Vapor pressure of water
= 768.0 Torr - 17.5 Torr = 750.5 Torr = 0.987 atm
(1 Torr = 0.001315 atm)
Pressure of hydrogen gas =P = 0.986 atm
Temperature at which gas was collected ,T= 20°C = 293.15 K
Volume of the gas ,V= 75.3 mL = 0.0753 L
Moles of hydrogen gas = n
PV=nRT (An ideal gas equation)

0.003088 moles of hydrogen gas were formed .