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A compound has the following percentage composition (H = 2.04%, S = 32.65%, O = 65.31%.
Relative molecular mass of compound = 98. What will be its molecular formula (H = 1, S = 32, O = 16)
- a)HSO4
- b)H(SP4)2
- c)H2(SO4)3
- d)H2SO4
Correct answer is option 'D'. Can you explain this answer?
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Most Upvoted Answer
A compound has the following percentage composition (H = 2.04%, S = 3...
- The first step in this problem is to change the % to grams.32.65%→32.65g of S65.3%→65.3g of O2.04%→2.04g of H
- Next divide all the given masses by their molar mass.32.65g of S/ 32gm-1 = 1.0203 moles of S65.3g of O/ 16gm-1 = 4.08 moles of O2.04g of H/ 1.008gm-1 = 2.024 moles of H
- Then, pick the smallest answer in moles from the previous step and divide all the answers by that. Remember that if you calculate a number that is x0.9 round to the nearest whole number1.0203 moles of S/ 1.0203 = 14.08 moles of O/1.0203 = 3.998 ≈ 42.024 moles of H/1.0203 = 1.984 ≈ 2
- Lastly, the coefficients calculated in the previous step will become the subscripts in the chemical formula.S = 1O = 4H = 2H2SO4
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A compound has the following percentage composition (H = 2.04%, S = 3...
Percentage Composition:
- H = 2.04%
- S = 32.65%
- O = 65.31%
Relative Molecular Mass:
- Compound = 98
Calculating the Number of Moles:
To determine the molecular formula, we need to calculate the number of moles for each element present in the compound. We can do this using the following steps:
1. Assume we have 100g of the compound.
2. Calculate the mass of each element in the compound using the given percentage composition.
- H: (2.04/100) * 100g = 2.04g
- S: (32.65/100) * 100g = 32.65g
- O: (65.31/100) * 100g = 65.31g
3. Convert the mass of each element to moles using the atomic mass of the element.
- H: 2.04g / 1g/mol = 2.04 moles
- S: 32.65g / 32g/mol = 1.0203 moles
- O: 65.31g / 16g/mol = 4.082 moles
Calculating the Simplest Ratio:
To determine the molecular formula, we need to find the simplest whole-number ratio of the elements in the compound. We can do this by dividing the number of moles of each element by the smallest number of moles.
1. Divide the number of moles of each element by the smallest number of moles (1.0203 moles in this case).
- H: 2.04 moles / 1.0203 moles = 2
- S: 1.0203 moles / 1.0203 moles = 1
- O: 4.082 moles / 1.0203 moles = 4
2. Round the ratios to the nearest whole number.
- H: 2
- S: 1
- O: 4
Determining the Molecular Formula:
Now that we have the simplest ratio, we can determine the molecular formula.
1. Write the symbol of each element.
- H
- S
- O
2. Write the subscript for each element based on the ratio.
- H2
- S1
- O4
3. Simplify the formula by removing any subscripts of 1.
- H2
- S
- O4
4. Write the molecular formula using the simplified formula.
- H2SO4
Therefore, the molecular formula of the compound is H2SO4, which is option D.
- H = 2.04%
- S = 32.65%
- O = 65.31%
Relative Molecular Mass:
- Compound = 98
Calculating the Number of Moles:
To determine the molecular formula, we need to calculate the number of moles for each element present in the compound. We can do this using the following steps:
1. Assume we have 100g of the compound.
2. Calculate the mass of each element in the compound using the given percentage composition.
- H: (2.04/100) * 100g = 2.04g
- S: (32.65/100) * 100g = 32.65g
- O: (65.31/100) * 100g = 65.31g
3. Convert the mass of each element to moles using the atomic mass of the element.
- H: 2.04g / 1g/mol = 2.04 moles
- S: 32.65g / 32g/mol = 1.0203 moles
- O: 65.31g / 16g/mol = 4.082 moles
Calculating the Simplest Ratio:
To determine the molecular formula, we need to find the simplest whole-number ratio of the elements in the compound. We can do this by dividing the number of moles of each element by the smallest number of moles.
1. Divide the number of moles of each element by the smallest number of moles (1.0203 moles in this case).
- H: 2.04 moles / 1.0203 moles = 2
- S: 1.0203 moles / 1.0203 moles = 1
- O: 4.082 moles / 1.0203 moles = 4
2. Round the ratios to the nearest whole number.
- H: 2
- S: 1
- O: 4
Determining the Molecular Formula:
Now that we have the simplest ratio, we can determine the molecular formula.
1. Write the symbol of each element.
- H
- S
- O
2. Write the subscript for each element based on the ratio.
- H2
- S1
- O4
3. Simplify the formula by removing any subscripts of 1.
- H2
- S
- O4
4. Write the molecular formula using the simplified formula.
- H2SO4
Therefore, the molecular formula of the compound is H2SO4, which is option D.
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A compound has the following percentage composition (H = 2.04%, S = 32.65%, O = 65.31%.Relative molecular mass of compound = 98. What will be its molecular formula (H = 1, S = 32, O = 16)a)HSO4b)H(SP4)2c)H2(SO4)3d)H2SO4Correct answer is option 'D'. Can you explain this answer?
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A compound has the following percentage composition (H = 2.04%, S = 32.65%, O = 65.31%.Relative molecular mass of compound = 98. What will be its molecular formula (H = 1, S = 32, O = 16)a)HSO4b)H(SP4)2c)H2(SO4)3d)H2SO4Correct answer is option 'D'. Can you explain this answer? for Class 9 2024 is part of Class 9 preparation. The Question and answers have been prepared according to the Class 9 exam syllabus. Information about A compound has the following percentage composition (H = 2.04%, S = 32.65%, O = 65.31%.Relative molecular mass of compound = 98. What will be its molecular formula (H = 1, S = 32, O = 16)a)HSO4b)H(SP4)2c)H2(SO4)3d)H2SO4Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 9 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A compound has the following percentage composition (H = 2.04%, S = 32.65%, O = 65.31%.Relative molecular mass of compound = 98. What will be its molecular formula (H = 1, S = 32, O = 16)a)HSO4b)H(SP4)2c)H2(SO4)3d)H2SO4Correct answer is option 'D'. Can you explain this answer?.
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