Question

Рассчитать Mr Cu3(PO4)2; Al(OH)3; Na2SiO3

Answer 1

Mr(Cu3(PO4)2) = 64*3+31*2+16*8=3697

Mr(Al(OH)3)=27+16*3+1*3=132

Mr(Na2SiO3)=23*2+28+16*2=180

Answer 2

Calculation of Mr (Molar Mass)

To calculate the molar mass of a compound, we need to determine the atomic masses of each element in the compound and then sum them up.

Let's calculate the molar mass of the given compounds:

1. Cu3(PO4)2 (Copper (II) Phosphate): - Atomic mass of Cu = 63.55 g/mol - Atomic mass of P = 30.97 g/mol - Atomic mass of O = 16.00 g/mol

The compound contains 3 copper atoms, 2 phosphorus atoms, and 8 oxygen atoms.

Molar mass of Cu3(PO4)2 = (3 * 63.55) + (2 * 30.97) + (8 * 16.00) g/mol

2. Al(OH)3 (Aluminum Hydroxide): - Atomic mass of Al = 26.98 g/mol - Atomic mass of O = 16.00 g/mol - Atomic mass of H = 1.01 g/mol

The compound contains 1 aluminum atom, 3 oxygen atoms, and 3 hydrogen atoms.

Molar mass of Al(OH)3 = (1 * 26.98) + (3 * 16.00) + (3 * 1.01) g/mol

3. Na2SiO3 (Sodium Silicate): - Atomic mass of Na = 22.99 g/mol - Atomic mass of Si = 28.09 g/mol - Atomic mass of O = 16.00 g/mol

The compound contains 2 sodium atoms, 1 silicon atom, and 3 oxygen atoms.

Molar mass of Na2SiO3 = (2 * 22.99) + 28.09 + (3 * 16.00) g/mol

Let's calculate the molar masses using the atomic masses mentioned above.

Calculation Results

1. Cu3(PO4)2 (Copper (II) Phosphate): - Molar mass of Cu3(PO4)2 = (3 * 63.55) + (2 * 30.97) + (8 * 16.00) g/mol - Molar mass of Cu3(PO4)2 = 380.58 g/mol 2. Al(OH)3 (Aluminum Hydroxide): - Molar mass of Al(OH)3 = (1 * 26.98) + (3 * 16.00) + (3 * 1.01) g/mol - Molar mass of Al(OH)3 = 78.00 g/mol 3. Na2SiO3 (Sodium Silicate): - Molar mass of Na2SiO3 = (2 * 22.99) + 28.09 + (3 * 16.00) g/mol - Molar mass of Na2SiO3 =