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7. (a) Air contains several gaseous elements - Edexcel - GCSE Chemistry - Question 7 - 2020 - Paper 1
Question 7
7. (a) Air contains several gaseous elements. Which of these shows the three most common gaseous elements in air, listed in order from the most common to the least ... show full transcript
Worked Solution & Example Answer:7. (a) Air contains several gaseous elements - Edexcel - GCSE Chemistry - Question 7 - 2020 - Paper 1
Step 1
Use the results to calculate the density of argon in g cm⁻³.
Answer
To calculate the density of argon, we first need to find the mass of argon alone:
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Calculate the mass of argon:
\text{Mass of argon} = \text{Mass of flask with argon} - \text{Mass of flask} = 79.120 , \text{g} - 78.639 , \text{g} = 0.481 , \text{g}.
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Use the equation for density:
\text{Density} = \frac{\text{Mass}}{\text{Volume}} = \frac{0.481 , \text{g}}{250.0 , \text{cm}^3}.
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Calculate the density:
\text{Density} = 0.001924 , \text{g cm}^{-3}.
Therefore, the density of argon is approximately 0.0019 g cm⁻³.