Use the periodic table to calculate the molar mass of each compound below. give your answer to the correct number of significant figures. sodium hydroxide (naoh): 2 g/mol water (h2o): 4 g/mol glucose (c6h12o6): 2 g/mol calcium sulfate (caso4): 1 g/mol magnesium phosphate (mg3(po4)2): 1 g/mol

From the periodic table you get the atomic masses of each element.

These are the values that I have in my periodic table (use those numbers of your periodic table if your teache gave you a specific one)

Na: 23 g/mol
O: 16 g/mol
H: 1 g/mol
C: 12 g/mol
Ca: 40 g/mol
S: 32 g/mol
Mg: 24 g/mol
P: 31 g/mol

Now I will do some examples and you do the others:

1) NaOH: 1 atom of Na * 23 g/mol + 1 atom of O * 16 g/mol + 1 atom of H * 1 g/mol

=> 1*23g/mol + 1*16g/mol + 1*1g/mol = 40 g/mol

2) H2O

=> 2 atoms of H * 1 g/mol + 1 atom of O * 16 g/mol = 2*1g/mol + 1*16g/mol = 18 g/mol

3) Glucose: C6H12O6

6*12 g/mol + 12 * 1g/mol + 6*16 g/mol = 72g/mol + 12g/mol + 96 g/mol = 180 g/mol

4) CaSO4:

1*40 g/mol + 1*32g/mol + 4*16g/mol = 136 g/mol

Now you only have to do the last one by your own.

Molar mass is the sum of the atomic mass of  the constituent atoms. The molar mass of Sodium hydroxide, water, glucose,  Calcium sulfate, and Magnesium phosphate is 40 g/mol, 18g/mol, 180g/mol, 136g/mol and 269.8g/mole respectively.

Molar mass is the mass of 1 mole of atom, ion or molecule. It is measured in g/mol.

In a molecule molar mass is the sum of the atomic mass of  the constituent atoms. The atomic mass of the following atoms in the periodic table is

H - 1 g/mol                 C - 12 g/mol

O -16 g/mol                Na-  23 g/mol

Ca - 40 g/mol            S - 32 g/mol

Mg - 24 g/mol            P - 31 g/mol

The molar mass of  Sodium hydroxide

NaOH = 23 + 16+ 1  = 40 g/ mol

The molar mass of water

= (2 x 1) + 16 = 18 g/mol

The molar mass of Glucose

The molar mass of Calcium sulfate

The molar mass of Magnesium phosphate  

Hence, we can conclude that the molar mass of Sodium hydroxide, water, glucose,  Calcium sulfate, and Magnesium phosphate is 40 g/mol, 18g/mol, 180g/mol, 136g/mol and 269.8g/mole respectively.

To know more about molar mass, refer the link:

link

When a parcel of air is allowed to expand it cools off.