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Chemistry help please ?!

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    Magnesium metal reacts with excess sulphuric acid. What mass of magnesium (in grams) is required to produce 100 cm³ of hydrogen.
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    Use the stoichiometry of the reaction. Calculate the number of moles of hydrogen and then use this to calculate the number of moles of magnesium and then mass = mr x moles
 
 
 
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