Typically kinetic energy changes is passed through objects when it crashes
Answer:
20cm³ of sulphuric acid reacts completely with excess zinc to form 0.1 mole of hydrogen gas. Calculate the molarity of the acid used.?
Molarity= mol/volume
Molarity= 0.1/20
Molarity= 0.005mol/L
Explanation:
Answer:
100gmol⁻¹
Explanation:
Problem: To calculate the molecular mass of
KHCO₃
Solution
The molar mass of a substance is defined as the number of grams per mole of that substance.
To determine the molar mass of this compound we find:
> the component atomic masses
>we express it in gmol⁻¹
From the periodic table, the atomic masses of the elements in the given compound are:
K = 39g
H = 1g
C = 12g
O = 16g
Now let's add these numbers together:
KHCO₃ = [39 + 1 + 12 + (16x3)]
= 39 +13 +48
= 100g
Molar mass of KHCO₃ = 100gmol⁻¹
Explanation:
Law of conservation of matter/mass
the law of conservation of mass states that matter cannot be created nor destroyed but can be changed from one form to another.
by Antoine Lavoisier
Law of multiple proportions
the law of multiple proportions states that if two elements, A and B combine to form more than one chemical compound, the various masses of element A, which combine separately with a fixed mass of the other element B are in simple multiple ratios.
by chemist John Dalton
Law of reciprocal proportion
the law of reciprocal proportion states that the masses of several elements A, B, C
which combine separately with a fixed mass of another element D are the same as or simple multiples of, the masses in which A, B, and C themselves combine.
by Jeremias Richter
Law of definite proportions
the law of definite proportions states that all pure samples of a particular chemical combined contain similar elements combined in the same proportion by mass.
by Joseph Proust
