Chemistry, 01.07.2019 01:40 Dajuan2x

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

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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.

Answer from: honestty21

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

$\bold{(H_2O)}$ = (2 x 1) + 16 = 18 g/mol

The molar mass of Glucose

$\bold{C_6H_1_2O_6 = (6\times12 )+( 12\times 1 )+( 6\times 16 ) = 180}$

The molar mass of Calcium sulfate

$\bold {(CaSO_4 = 40 + 32 + 4\times 16 = 136 g/mol}$

The molar mass of Magnesium phosphate

$\bold{ Mg_3(PO_4)_2 = 3\times 24 + 2( 31 + 4\times16) = 169.8g/mol}$

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

Answer from: Quest

Yes it would be a physical change.

Answer from: Quest

Cis the answer ur welcome if i get it wrong u don't have to me

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