if 25 grams of copper reacti with 70 grams of sodium carbonate, identify the limiting reagent.

To identify the limiting reagent in a chemical reaction, you need to calculate the amount of product that can be formed from each reactant and compare the values. The reactant that produces the lesser amount of product is the limiting reagent.

1. Start by writing the balanced chemical equation for the reaction:
Cu + Na2CO3 -> CuCO3 + 2Na

2. Calculate the number of moles of each reactant. You can do this by dividing the given mass of each reactant by their respective molar masses.
Moles of copper = 25g / molar mass of copper
Moles of sodium carbonate = 70g / molar mass of sodium carbonate

3. Use the stoichiometric ratios from the balanced equation to determine the moles of product that can be formed.
Moles of copper carbonate = moles of copper

4. Compare the calculated moles of product. The reactant that produces the lesser amount of product is the limiting reagent.

In this case, you will need to calculate the moles of copper and sodium carbonate and compare them to see which reactant limits the reaction. Once you have calculated the moles, you can follow steps 3 and 4 to determine the limiting reagent.