Answer:
The study of the interaction of electrical and magnetic fields, and their interaction with matter, is called Electromagnetism
Nobelium discovered in Berkeley California
The reaction is: HCl + Na HCO3 → NaCl + H2CO3, which is already balanced.
Then the molar ratios are 1 mol HCL : 1 mol NaHCO3
You know the mass of NaHCO3 is 0.100 g, then you can find the number of moles using the molar mass of NaHCO3
molar mass of NaHCO3 is 23 g/mol + 1 g/mol + 12g/mol + 3*16g/mol = 84 g/mol
And the number of moles is: 0,100 g / 84 g/mol = 0,0012 mol of NaHCO3.
Then, from the ratio 1:1, you know that, at the titration point, the number of moles of HCl is the same: 0,0012 mol of HCl.
Now from the fomula of molarity you have: M = #of moles / V in liters
=> V in liters = # of moles / M = 0.0012 mol / 0.100 M = 0.012 liters
Answer: 0.012 liters of HCL
<u>Given</u>:
Wavelength (λ) of the laser pulse = 545 nm = 5.45 * 10⁻⁹ m
Total energy of pulse = 4.85 mJ
<u>To determine:</u>
The number of photons in the laser of a given energy
<u>Explanation:</u>
Energy per photon (E) = hc/λ
where h = planck's constant = 6.626 *10⁻³⁴ Js
C = speed of light = 3*10⁸ m/s
λ = wavelength
E = 6.626 *10⁻³⁴ Js* 3*10⁸ms-1 /5.45 * 10⁻⁹ m = 3.65 * 10⁻¹⁹ J
Now,
# photons = total energy/Energy per photon
= 4.85 * 10⁻³ J* 1 photon / 3.65 * 10⁻¹⁹ J = 1.32 * 10¹⁶ photons
Ans: the laser pulse contains 1.32 * 10¹⁶ photons
