MYTUTOR SUBJECT ANSWERS

3537 views

Calculate the percentage, by mass, of carbon in sodium hydrogencarbonate (NaHCO3)

When faced with this style of problem there are steps to correctly answer the quesion:

Step 1 - identify the atomic mass of carbon

Step 2 - calculate the atomic mass of the compound

Step 3 - work out the percentage, by mass, of carbon in the compound

Method:

Step 1:

To  calculate the atomic mass, a periodic table is required. The atomic mass of each element is located at the top of the element, displayed as a number. In this case carbon has an atomic mass of 12 g/mol.

Step 2:

The same principles in step 1 are required and applied to the remaining atoms in the compound - sodium hydrogen carbonate. The atoms in the compound are sodium (Na), hydrogen (H), carbon (C) and oxygen (O). Looking at the value of atomic mass on the periodic table, the values of atomic mass are as follows:

Na = 23 g/mol

H = 1 g/mol

C = 12 g/mol

O = 16 g/mol

There is 1 Na atom, 1 H atom, 1 C atom and 3 O atoms in the compound. Now add these values together to get the atomic mass of the compound as such:

23+1+12+(3*16) = 84 g/mol

Step 3:

Now the percentage, by mass, needs to be calculated. The general rule for calculating a percentage is:

percentage = (value/total)*100%

Therefore by applying this rule for our problem we find that

Percentage = (12/84)*100% = 14.3 % (to 1 d.p)

Hayden T. GCSE Chemistry tutor, A Level Chemistry tutor, GCSE Maths t...

1 year ago

Answered by Hayden, a GCSE Chemistry tutor with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

358 SUBJECT SPECIALISTS

£18 /hr

Anil L.

Degree: Chemical Engineering (Masters) - University College London University

Subjects offered:Chemistry, Physics+ 2 more

Chemistry
Physics
Maths
Economics

“Patient, friendly and approachable - my aim is to help you excel in your chosen area of study by aiding you in gaining an appreciation for what you are learning”

MyTutor guarantee

£18 /hr

Luwaiza M.

Degree: MBBS (Bachelors) - Kings, London University

Subjects offered:Chemistry, Maths+ 5 more

Chemistry
Maths
Human Biology
Classical Civilisation
.UKCAT.
-Personal Statements-

“”

£22 /hr

Ed W.

Degree: Medicine (Bachelors) - Edinburgh University

Subjects offered:Chemistry, Maths+ 3 more

Chemistry
Maths
Further Mathematics
Biology
-Medical School Preparation-

“Hi! I'm Ed and I'm currently studying Medicine at the University of Edinburgh. I tutor at GCSE and A Level forBiology, Chemistry and Maths, and at GCSE level forFurther Maths. These are subjects I'm very comfortable in and enjoy. With ...”

About the author

Hayden T.

Currently unavailable: for new students

Degree: MChem Chemistry (Masters) - Warwick University

Subjects offered:Chemistry, Maths+ 1 more

Chemistry
Maths
Biology

“About me:As a first year student at the University of Warwick studying an integrated Masters in Chemistry, I have always had a keen interest in all the sciences and maths, and enjoy these subjects at all levels of education. I aim to...”

You may also like...

Posts by Hayden

Calculate the percentage, by mass, of carbon in sodium hydrogencarbonate (NaHCO3)

What are isotopes and how do they differ from each other?

Other GCSE Chemistry questions

Why doesn't the concentration of products or reactants change when a reaction is at dynamic equilibrium?

How do you test for alkenes and alkanes?

Explain why graphite is able to conduct electrcity and diamond is not

What effect does temperature change have on an equilibrium reaction?

View GCSE Chemistry tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok