Calculate the molecular masses of the following and find the percentage of hydrogen in given compounds : Nitric acid (HNO3), Glucose (C6H12O6), Water (H2O), Ammonia (NH3)
Given: (H= 1 N= 14 C= 12 O= 16)
Answers
Answer:
Wako
FAQ
QA number：17743
Q
How to calculate the molar concentration of the solution
A
The molar concentration unit [mol/ L (M)] is a conventionally widely used as concentration method. It is the number of moles of target substance (solute) dissolved in 1 liter of solution. Here is how to calculate the concentration.
(Weight of 1 liter solution) x (purity) ÷ molecular weight
[Specific gravity of solution (g/mL) x 1,000 (mL) x Purity (w/w%) /100 ÷ Molecular weight]
For example, let's calculate the molar concentration of 2-mercaptoethanol (HSCH2CH2OH). The necessary information is as follows.
Specific gravity (or density) = 1.114 g/mL
Purity (or content) = 100 w/w% (assumed)
Molecular weight = 78.13
By calculating this value by applying this value to the above equation, you can know the molar concentration.
1.114 g/mL x 1,000mL x 100w/w%/100 ÷ 78.13 = 14.26mol/L
In order to caluculate the concentration like above, it is necessary to know three points of "specific gravity (or density)", "purity (or content)" and "molecular weight". The table below is a quick reference chart of common acid and base concentrations. In acid and alkali, there is a use for "neutralization titration", "normality (N)" is often used.