Question

Mr(MgCl2)= Mr(Cu(NO3)= Mr(SiO2)= Mr(Ba(OH)2)=

Answer 1

Ответ:

Mr(MgCl2)=95

Mr(Cu(NO3)=125

Mr(SiO2)=60

Mr(Ba(OH)2)=171

Объяснение:

Answer 2

To calculate the molar mass (Mr) of compounds, you need to sum the atomic masses of all the atoms in the chemical formula. Here are the molar masses for the compounds you mentioned:

1. MgCl2 (Magnesium chloride):

   • Mg (Magnesium) has a molar mass of approximately 24.31 g/mol.
   • Cl (Chlorine) has a molar mass of approximately 35.45 g/mol. So, the molar mass of MgCl2 is: 2 * (24.31 g/mol) + 2 * (35.45 g/mol) = 48.62 g/mol + 70.90 g/mol = 119.52 g/mol.

2. Cu(NO3)2 (Copper(II) nitrate):

   • Cu (Copper) has a molar mass of approximately 63.55 g/mol.
   • N (Nitrogen) has a molar mass of approximately 14.01 g/mol.
   • O (Oxygen) has a molar mass of approximately 16.00 g/mol. So, the molar mass of Cu(NO3)2 is: 1 * (63.55 g/mol) + 2 * (14.01 g/mol) + 6 * (16.00 g/mol) = 63.55 g/mol + 28.02 g/mol + 96.00 g/mol = 187.57 g/mol.

3. SiO2 (Silicon dioxide, also known as silica):

   • Si (Silicon) has a molar mass of approximately 28.09 g/mol.
   • O (Oxygen) has a molar mass of approximately 16.00 g/mol. So, the molar mass of SiO2 is: 1 * (28.09 g/mol) + 2 * (16.00 g/mol) = 28.09 g/mol + 32.00 g/mol = 60.09 g/mol.

4. Ba(OH)2 (Barium hydroxide):

   • Ba (Barium) has a molar mass of approximately 137.33 g/mol.
   • O (Oxygen) has a molar mass of approximately 16.00 g/mol.
   • H (Hydrogen) has a molar mass of approximately 1.01 g/mol. So, the molar mass of Ba(OH)2 is: 1 * (137.33 g/mol) + 2 * (16.00 g/mol) + 2 * (1.01 g/mol) = 137.33 g/mol + 32.00 g/mol + 2.02 g/mol = 171.35 g/mol.

These are the molar masses for the compounds you specified.