Advertisements
Advertisements
Question
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate mass of MnO2 used.
Advertisements
Solution
MnO2 = Mn + 2(O)
= 55 + 2(16)
= 55 + 32
= 87 g
1 mole of MnO2 weighs = 87 g (mol. Mass)
So, 0.02 mole will weigh = 87 × 0.02 = 1.74 g
APPEARS IN
RELATED QUESTIONS
Why should a magnesium ribbon be cleaned before it is burnt in the air?
What is meant by a chemical reaction? Explain with the help of an example.
One of the following is an exothermic reaction. This is:
Write the chemical equation for the following word equation and balance them.
Sodium reacts with water to form sodium hydroxide and hydrogen
In certain reaction an insoluble solid called precipitate is formed. State the colour and name of the precipitate formed in the following reaction involving addition of:
Dilute hydrochloric acid to silver nitrate.
Explain the term ‘chemical equation’.
Write a balanced equation for the following word equation:
Aluminium + Oxygen → Aluminium oxide
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
C2H5OH + 3O2 → 2CO2 + 2H2O
Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.
PbO2 +4HCl → PbCl2 + H2O + Cl2
Dil. HCl is added to Zn granules. How will you prove that chemical change has taken place here? Support your response with two arguments.
