Question

class 9th chemistry symbol latino mole concept ​

Answer 1

Answer:

In teh previous chapter, we discussed the concept of atomic mass. This concept can be extended to calculate molecular masses. The molecular mass of a substance is the sum of the atomic masses of all the atoms in a molecule of the substance. It is therefore the relative mass of a molecule expressed in atomic mass units (u).

Example 1

(a) Calculate the relative molecular mass of water (H2O).

Solution:

Atomic mass of hydrogen = 1u, oxygen = 16 u So the molecular mass of water, which contains two atoms of hydrogen and

one atom of oxygen is = 2 × 1+ 1 ×16 = 18 u

(b) Calculate the molecular mass of HNO3.

Solution:

The molecular mass of HNO3 = the atomic mass of H + the atomic mass of N+ 3 × the atomic mass of O= 1 + 14 + 48 = 63 u

Answer 2

Answer:

not answer I am in 5

Explanation:

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