What is the percentage by mass of N in NH₃?
Answer and explanation
Correct answer: D. 82.353%
- Step 1: Mass of N in one formula unit = 14; formula mass = 17. Step 2. Percentage = 14 ÷ 17 × 100 = 82.353%. Answer: 82.353%. Why not the others: 17.647% is what you get if you give the percentage of the other element. 45.161% is what you get if you divide by the wrong total. 8.235% is what you get if you misplace the decimal point.
Practise more Physics and chemistry.
Free questions with an explanation for every one, and full timed DTM University Entrance Test (Uzbekistan) mock tests.
More Physics and chemistry questions
- Which unit is used for force in the SI system?
- A car moving at 20 m/s accelerates at 2 m/s² for 5 s. What is its final speed?
- A resistor of 6 Ω carries a current of 2 A. What is the voltage across it?
- What is the kinetic energy of a 2 kg object moving at 3 m/s?
- A stone falls from rest for 2 s. Taking g = 10 m/s², how far does it fall?
- Which part of the electromagnetic spectrum has the highest frequency?