Question

Вычеслмте относительную молекулярную массу таких веществ: H2CO3, NAOH, KNO3 Прошу помогите)

Answer 1

Mr(H2CO3)=1*2+16*3+12=2+12+48=62
Mr(NaOH)=23+16+1=40
Mr(KNO3)=39+14+16*3=101

Answer 2

Mr(H2CO3) = 1*2 + 12 + 16*3 = 62
Mr(NaOH) = 23 + 16 +1 = 40
Mr(KNO3) = 39 + 14 + 16*3 = 101

Answer 3

Calculation of Relative Molecular Mass

To calculate the relative molecular mass (also known as the molecular weight) of a substance, we need to determine the sum of the atomic masses of all the atoms in its chemical formula.

Let's calculate the relative molecular masses of the following substances:

1. H2CO3 (Carbonic Acid): - The chemical formula of carbonic acid is H2CO3. - The atomic mass of hydrogen (H) is approximately 1.01 atomic mass units (amu). - The atomic mass of carbon (C) is approximately 12.01 amu. - The atomic mass of oxygen (O) is approximately 16.00 amu. - To calculate the relative molecular mass, we sum the atomic masses of all the atoms in the formula: (2 * 1.01 amu) + 12.01 amu + (3 * 16.00 amu). - Therefore, the relative molecular mass of H2CO3 is 62.03 amu.

2. NaOH (Sodium Hydroxide): - The chemical formula of sodium hydroxide is NaOH. - The atomic mass of sodium (Na) is approximately 22.99 amu. - The atomic mass of oxygen (O) is approximately 16.00 amu. - The atomic mass of hydrogen (H) is approximately 1.01 amu. - To calculate the relative molecular mass, we sum the atomic masses of all the atoms in the formula: 22.99 amu + 16.00 amu + 1.01 amu. - Therefore, the relative molecular mass of NaOH is 40.00 amu.

3. KNO3 (Potassium Nitrate): - The chemical formula of potassium nitrate is KNO3. - The atomic mass of potassium (K) is approximately 39.10 amu. - The atomic mass of nitrogen (N) is approximately 14.01 amu. - The atomic mass of oxygen (O) is approximately 16.00 amu. - To calculate the relative molecular mass, we sum the atomic masses of all the atoms in the formula: 39.10 amu + 14.01 amu + (3 * 16.00 amu). - Therefore, the relative molecular mass of KNO3 is 101.10 amu.

Please note that the values provided above are approximate atomic masses and may vary slightly depending on the source.