Answer:
Explanation:
E = (hc)/(λ)
E = (6.624x10^(-27))Js x ((3×10^8)ms^(-1)) /
(77.8x10^(-9)m)
E = 2.55 x 10^(-11) J
Answer:
Generally, density is measured using he SI unit for measurement of density which is kg/m³ or the cgs units used to describe the density of a substance which is g/cm³
However, due to its nature (being composed of varying amount proportions of different compounds mixed together resulting in a variation of the density of naturally produced crude oil) of having different densities whereby the lighter oils are more easily processed than the heavier variety of oils, oil density is related to the quality of the oil and it is usually measures in API gravity as follows;
°API = (141.5/S.G.) - 131.5
Where;
API = American Petroleum Institute
S. G. = Specific gravity
As such the API gravity of fresh water with a S. G. of 1.0 has is 10 degrees
Explanation:
Answer:
Indeed, the two samples should contain about the same number of gas particles. However, the molar mass of 
is larger than that of 
(by a factor of about 
.) Therefore, the mass of the sample is significantly larger than that of the sample.
Explanation:
The and the sample here are under the same pressure and temperature, and have the same volume. Indeed, if both gases are ideal, then by Avogadro's Law, the two samples would contain the same number of gas particles ( and molecules, respectively.) That is:
.
Note that the mass of a gas 
is different from the number of gas particles 
in it. In particular, if all particles in this gas have a molar mass of 
, then:
.
In other words,
.
.
The ratio between the mass of the and that of the sample would be:
.
Since by Avogadro's Law:
.
Look up relative atomic mass data on a modern periodic table:
Therefore:
.
.
Verify whether 
:
- Left-hand side:
. - Right-hand side:
.
Note that the mass of the sample comes with only two significant figures. The two sides of this equations would indeed be equal if both values are rounded to two significant figures.
:
.
:
.