Answer:
E = 2.93×10⁻¹⁹ J
Explanation:
Given data:
Wavelength of photon = 678 nm (678×10⁻⁹ m)
Energy of photon = ?
Solution:
Formula:
E = h c/λ
h = 6.63×10⁻³⁴ Js
c = 3×10⁸ m/s
E = 6.63×10⁻³⁴ Js × 3×10⁸ m/s / 678×10⁻⁹ m
E = 19.89 ×10⁻²⁶ Jm / 678×10⁻⁹ m
E = 0.0293×10⁻¹⁷ J
E = 2.93×10⁻¹⁹ J
The chemical reaction would be expressed as follows:
HBr + LiOH = LiBr + H2O
We are given the volumes and corresponding concentration to be used for the reaction. We use these values to solve for the concentration of the other reactant. We do as follows:
0.253 mol LiOH / L solution ( 0.01673 L ) ( 1 mol HBr / 1 mol LiOH ) = 0.00423 HBr needed
Concentration of HBr =0.00423mol / .010 L = <span>0.423 M HBr </span>
The mass of the piece of lead is calculated using the below formula
Q(heat)= mC delta T
Q = 78.0 j
M=mass =?
C=specific heat capacity ( 0.130 j/g/c
delat T=change in temperature = 9.0 c
by making M the subject of the formula
M = Q/ c delta T
M= 78.0 j/ 0.130 j/g/c x 9.0 c = 66.7 g of lead
Answer:
Mixture.
Pizza is a mixture of a lot of things like dough, sauce, meat, veggies, cheese, etc.
Each of those things is a mixture of other things like proteins, starches, sugars, water, fiber, vitamins, minerals, etc.
