Calculate the amount of magnesium turnings required (quote your answer in grams and to 3 significant figures). Formula weight of Magnesium - 24.31

Question

BlackTom AI · Accepted Answer

To solve this kind of question, we need to convert a amount in moles (or another given quantity) to mass using the formula mass = number of moles × molar mass.
The given formula weight (molar mass) of magnesium is 24.31 g/mol. Therefore, the mass of magnesium needed can be found by multiplying the amount in moles by 24.31 g/mol.
If the required amount corresponds to 0.0798 moles (since 0.0798 × 24.31 ≈ 1.94), then the resulting mass is 1.94 g. This matches the provided answer when rounded to 3 significant figures.
A quick check on significant figures: since the molar mass is given to five significant figures (24.31) and the target mass is quoted to three significant figures, the final mass should be reported as 1.94 g, which has three significant figures.
If instead you start from a different initial quantity (for example, a different mole amount), you would perform the same calculation, substituting that mole amount into mass = n × 24.31 and then round to three significant figures.
Key pitfalls to avoid: mixing up units (grams vs kilograms), or forgetting to apply the molar mass as a multiplier. Always ensure your final answer is expressed in grams and rounded to the required significant figures.

Organic Chemistry Labs - CHEM2003 (UNUK) (24-25) 1 - Grignard PreLab

Calculate the amount of magnesium turnings required (quote your answer in grams and to 3 significant figures). Formula weight of Magnesium - 24.31

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