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I believe this is the answer
Answer: 15.7 g CO2
Explanation: Solution attached:
CaCO3 => CaO + CO2
Convert mass of CaCO3 to moles.
Use the mole ratio of CaCO3 and CO2 from the balanced equation.
Convert moles of CO2 to mass using its molar mass.
Answer:
120 moles of Mg
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
3Mg + 2H₃PO₄ —> Mg₃(PO₄)₂ + 3H₂
From the balanced equation above,
3 moles of Mg reacted to produce 3 moles of H₂.
Finally, we shall determine the number of mole of Mg needed to produce 120 moles of H₂. This can be obtained as follow:
From the balanced equation above,
3 moles of Mg reacted to produce 3 moles of H₂.
Therefore, 120 moles of Mg will also react to produce 120 moles of H₂.
Thus, 120 moles of Mg is needed for the reaction.