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A metal oxide has the formula X₂O, where X is a Group 1 metal - OCR Gateway - GCSE Chemistry: Combined Science - Question 2 - 2023 - Paper 9

Question 2

A metal oxide has the formula X₂O, where X is a Group 1 metal. The relative formula mass of the metal oxide is 94.2. Relative atomic mass (Aᵣ): O = 16.0 What is t... show full transcript

Worked Solution & Example Answer:A metal oxide has the formula X₂O, where X is a Group 1 metal - OCR Gateway - GCSE Chemistry: Combined Science - Question 2 - 2023 - Paper 9

Step 1

Given Information

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Answer

The formula of the metal oxide is X₂O. The relative formula mass of the metal oxide is given as 94.2. The relative atomic mass of oxygen (O) is 16.0.

Step 2

Calculate the Relative Atomic Mass of X

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Answer

To find the relative atomic mass of X, we can use the formula for the relative formula mass:

$ext{Relative formula mass} = (2 imes Aᵣ(X)) + Aᵣ(O)$

Substituting in the known values gives:

$94.2 = (2 imes Aᵣ(X)) + 16.0$

Rearranging gives:

$2 imes Aᵣ(X) = 94.2 - 16.0 = 78.2$

Thus,

$Aᵣ(X) = \frac{78.2}{2} = 39.1$

Step 3

Identify X

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Answer

The relative atomic mass of X is 39.1. Looking at the options, Potassium (K) has an atomic mass of approximately 39.1. Therefore, the name of X is Potassium.

Step 4

Final Answer

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Answer

B Potassium

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