The equation for finding how many moles are in a substance is
moles = mass / relative formula mass,
where mass is measured in g.
The r.f.m. (relative formula mass) is found by adding together all of the atomic masses of the elements in a substance.
e.g. CO2 (carbon dioxide) has 1 atom of carbon and two atoms of oxygen.
The relative atomic mass of carbon is approximately 12.
The relative atomic mass of oxygen is approximately 16.
12 + (2 x 16) = 44
The r.f.m. of carbon dioxide is 44.
You would then divide the mass of the substance (how much there is of it) by its r.f.m. to find the mole number.
The answer is "C" because all isotopes have a different mass number. The number of protons does not change. The mass of electrons is negligible. Thus, the number of neutrons changes.
Answer:
The correct answer is option a.
Explanation:
Diffusion flux is defined as movement of mas of atoms diffusing through the unit area in per unit time.It measured in (
).
J = diffusion flux
A = Unit area A through which atoms moves.
M = mass of atoms passes in t interval of time.
Answer:
i think multipling 30 to the 40
30 × 40 = 1200ppt
Answer:
c) more particles collide with the walls of the container
Explanation:
More moles means more particles. If the volume remains the same, the collisions of more particles with the container walls cause the pressure to increase.
