GCSE OCR Gateway Chemistry 3.1 Measurement, Mass & Equations: What is the relative formula mas

What is the relative formula mass of sodium carbonate, Na₂CO₃? A 83.0 B 90.0 C 106.0 D 130.0 Your answer ____ - OCR Gateway - GCSE Chemistry - Question 4 - 2021 - Paper 1

Question 4

What is the relative formula mass of sodium carbonate, Na₂CO₃? A 83.0 B 90.0 C 106.0 D 130.0 Your answer ____

Worked Solution & Example Answer:What is the relative formula mass of sodium carbonate, Na₂CO₃? A 83.0 B 90.0 C 106.0 D 130.0 Your answer ____ - OCR Gateway - GCSE Chemistry - Question 4 - 2021 - Paper 1

Step 1

Calculate the relative mass of sodium (Na)

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Answer

Sodium (Na) has a relative atomic mass of approximately 23.0. Since there are 2 sodium atoms in sodium carbonate (Na₂CO₃), the total mass for sodium is:

$2 imes 23.0 = 46.0$

Step 2

Calculate the relative mass of carbon (C)

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Answer

Carbon (C) has a relative atomic mass of approximately 12.0. Since there is 1 carbon atom in sodium carbonate, the total mass for carbon is:

$1 imes 12.0 = 12.0$

Step 3

Calculate the relative mass of oxygen (O)

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Answer

Oxygen (O) has a relative atomic mass of approximately 16.0. Since there are 3 oxygen atoms in sodium carbonate, the total mass for oxygen is:

$3 imes 16.0 = 48.0$

Step 4

Calculate the total relative formula mass of Na₂CO₃

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Answer

Add the total mass of sodium, carbon, and oxygen:

$46.0 + 12.0 + 48.0 = 106.0$

Thus, the relative formula mass of sodium carbonate, Na₂CO₃, is 106.0.

Step 5

Select the correct answer

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Answer

Based on the calculation, the correct answer is C 106.0.

What is the relative formula mass of sodium carbonate, Na₂CO₃? A 83.0 B 90.0 C 106.0 D 130.0 Your answer ____ - OCR Gateway - GCSE Chemistry - Question 4 - 2021 - Paper 1

Worked Solution & Example Answer:What is the relative formula mass of sodium carbonate, Na₂CO₃? A 83.0 B 90.0 C 106.0 D 130.0 Your answer ____ - OCR Gateway - GCSE Chemistry - Question 4 - 2021 - Paper 1

Calculate the relative mass of sodium (Na)

Calculate the relative mass of carbon (C)

Calculate the relative mass of oxygen (O)

Calculate the total relative formula mass of Na₂CO₃

Select the correct answer

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