It depends if you are taking the class in high school or college. For college doing the experiments is fun but the calculations is not. Also if you are taking it, bring friends.
The chemical formula of nitrogen dioxide is NO2. It is a brown coloured gas.
<span>A Chemical equation is useful because it shows all the
elements or compounds involved on a chemical reaction. It also shows which
elements or compounds are the products and which are the reactants. The behavior of each element or compound can
also be seen in the equation, on what each element or compound did as to where
they went or what they formed when they reacted. Chemical equations are very useful because all
information are found in one equation, thus, no need for a lot of reading.</span>
Answer:
0.38 moles He
Explanation:
from the ideal gas law PV= nRT you can calculate the volume of 1 mole at STP (273..1K and 1 atm of pressure) the MOLAR VOLUME IS
22.4 L
In the problem you have 8.4L
8.4 L/22.4 L=0.375 moles
so
0.38 moles He
Answer:

Explanation:
We must do the conversions:
mass of CaCO₃ ⟶ moles of CaCO₃ ⟶ moles of CaCl₂
We will need a chemical equation with masses and molar masses, so, let's gather all the information in one place.
Mᵣ: 100.09 110.98
CaCO₃ + 2HCl ⟶ CaCl₂ + CO₂ + 2HCl
m/g: 27.9
(a) Moles of CaCO₃
(b) Moles of CaCl₂
