How to calculate the mass - chemistry?

L

Lovee.Bugg x

New member
How do i calculate the mass of
3 moles of sodium chloride,
0.1 moles of hydrochloric acid
0.3 moles of ammonia
i duno any of the numbers for any of this help me please x
thanks xx
 
multiply with molar mass of each respectively

you need to know each molecule's formula

NaCl
HCl
NH3

find the molar mass by referring to the periodic table

for sodium chloride - molar mass = 23 + 35.45 = 58.45
mass = mole x molar mass
= 3 * 58.45
= 175.35 g

solve for the other two by using the same step.
 
Okay so in order to do this you first need to figure out the molar mass

NaCl

1 Na * 22.98976928 = 22.990
1 Cl * 35.453 = 35.453
Total:58.443 g/mol

3 moles NaCl x (58.442g / 1 mol NaCl) = 175.326g

HCL

1 H * 1.00794 = 1.008
1 Cl * 35.453 = 35.453
Total:36.461 g/mol

.1 moles HCl x (36.461g/1 mol HCl) = 3.646g HCl

Ammonia (NH3)
1 N * 14.0067 = 14.007
3 H * 1.00794 = 3.024
Total:17.031 g/mol

.3 moles NH3 x (17.031g / 1 mol NH3) = 5.1093g


You just figure out the molar mass (amu of element x the number of the element in the formula all added together. Then multiply that by the number of moles.
 
one mole of NaCl is 22+35.5gm
for 3 it is 3*(22+35.5)gm


for 1 mole HCl its 36.5gm
for .1 its 3.65gm


for 1 mole of ammonia 17 gm
for .3 its 178.3=5.1gm
 
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