Question 1
Question detail
Explain how to convert a mass of 0.5 g of sodium chloride (NaCl) into moles. Include the necessary calculations.
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At a glance
Question
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exam_style
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Topic
Use of amount of substance in relation to masses of pure substances
Question
Explain how to convert a mass of 0.5 g of sodium chloride (NaCl) into moles. Include the necessary calculations.
Answer
To convert the mass of sodium chloride into moles, first calculate its relative formula mass (Mr). The Mr of NaCl is approximately 58.5 g/mol. Then, use the formula: moles = mass / Mr. Therefore, moles = 0.5 g / 58.5 g/mol = 0.00855 mol.
Explanation
This question tests the student's understanding of how to use the relationship between mass and moles, specifically applying the formula for moles. It requires knowledge of relative formula mass and the ability to perform a calculation.
Common mistake
Decimal Misplacement
Students often misplace the decimal point when converting mass values, leading to incorrect calculations.
Always double-check the placement of the decimal point and ensure that you are using the correct units when performing calculations.
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