Answer:
0.00642mole
Explanation:
Molar Mass of Cu = 63.5g/mol
Mass of Cu from the question = 0.4076g
Number of mole =?
Number of mole = Mass /Molar Mass
Number of mole of Cu = 0.4076/63.5 = 0.00642mole
Molarity is the most convenient way to express concentration.
Mathematically, molarity is expressed as

In present case,
mass of solute (KCl) = 36 g
molecular weight of KCl = 74.55 g/mol
volume of solution = 100 ml = 0.1 l
∴ Molarity =

= 4.829 M
Thus, conc. of saturated KCl at 20 oC is 4.829 M
Answer:
the reaction is: Na2CO3 + 2HCl ===》 2NaCl + H2O + CO2(g)
We use the periodic table in chemistry. The periodic tables of elements allows us to locate elements and see the atomic mass, the mass number, and the symbol of elements.
Rows are known as periods. And columns are known as groups.
-Seth