MYTUTOR SUBJECT ANSWERS

1223 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...

10 months ago

Answered by Hayden, a GCSE Chemistry tutor with MyTutor


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

210 SUBJECT SPECIALISTS

£18 /hr

Christie M.

Degree: Medicine and surgery (Bachelors) - Newcastle University

Subjects offered: Chemistry, Maths+ 4 more

Chemistry
Maths
English Literature
Biology
.UKCAT.
-Personal Statements-

“Hi, I'm Christie, currently studying 'Medicine and Surgery' at Newcastle University! I aim to share my recent experience of gaining a place at medical school plus to assist individuals who find biology or chemistry a challenge.”

£30 /hr

Shelby P.

Degree: Veterinary Science (Bachelors) - Bristol University

Subjects offered: Chemistry, Maths+ 2 more

Chemistry
Maths
Human Biology

“About Me: I am a post-graduate veterinary student in my fourth year at Bristol Univeristy. I graduated from Bristol in 2013 with a First Class Honours in Biological Sciences before starting another degree in Veterinary Sciences so it...”

£18 /hr

Karol B.

Degree: Biochemistry (Masters) - St. Andrews University

Subjects offered: Chemistry, Maths+ 2 more

Chemistry
Maths
Biology
-Personal Statements-

“I am a biochemistry student at the University of St Andrews. I have always had a great passion for tutoring in the sciences. One of my main career plans for the future is to become an international school teacher for IB Chemistry and ...”

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

How to balance a chemical equation.

How do metals conduct electricity?

What is Le Chatelier's principle and how do you apply it to reversible reactions?

How can I check if my reaction equations are correct?

View GCSE Chemistry tutors

Cookies:

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

mtw:mercury1:status:ok