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.
Strontium (Sr). Elements in the same group of the periodic table have similar characteristics.
Answer:
<h2>2.45 g/mL</h2>
Explanation:
The density of a substance can be found by using the formula
We have
We have the final answer as
<h3>2.45 g/mL</h3>
Hope this helps you
Answer:
lanthanum
Explanation:
lanthanum is an inner transition metal
