MYTUTOR SUBJECT ANSWERS

2916 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

276 SUBJECT SPECIALISTS

£18 /hr

Javed R.

Degree: Biomedical Engineering (Bachelors) - Liverpool University

Subjects offered:Chemistry, Maths

Chemistry
Maths

“Postgraduate Biomedical Engineering student at the University of Strathclyde. Past classroom experience.”

£22 /hr

Xanthe W.

Degree: Biological Sciences with a Year in Industry/Research (Bachelors) - Imperial College London University

Subjects offered:Chemistry, Maths+ 1 more

Chemistry
Maths
Biology

“Top tutor from the renowned Russell university group, ready to help you improve your grades.”

£20 /hr

George N.

Degree: Chemistry (Masters) - York University

Subjects offered:Chemistry, Physics

Chemistry
Physics

“20 year old second year chemistry student at the University of York. Drummer, guitarist, rugby player and radio host who has experience and a love for tutoring.”

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

What is hydrocarbon?

An equilibrium between hydrogen and nitrogen to make ammonia. Explain what would happen to the amount of product if a) pressure was increased b) temperature was increased c) a catalyst was added. Energy change -92KJ/mol

How do you make calcium hydroxide (Ca(OH)2) from Calcium carbonate (CaCO3) and what are the equations.

What is the equation for complete combustion and what does it require?

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