Which of the following chemical equations corresponds to the standard molar enthalpy of formation of Na2CO3(s)? 2Na(s) + C(s) + 3/2O2(g) → Na2CO3(s)
2Na(s) + C(s) + 3O(g) → Na2CO3(s)
Na2O(s) + CO2(g) → Na2CO3(s)
Na2O2(s) + CO(g) → Na2CO3(s)
Na2(s) + C(s) + 3O(g) → Na2CO3(s)

Which of these is not an example of chemical weathering? a. iron-rich mineral rusting b. feldspar turning into clay c. limestone reacting with acid d. granite breaking up into sand

Read the chemical equation. 2c2h2 + 5o2 → 4co2 + 2h2o which of the following statements would be correct if one mole of c2h2 was used in this reaction? one mole of oxygen was used in this reaction. five moles of oxygen were used in this reaction. four moles of carbon dioxide were produced from this reaction. two moles of carbon dioxide were produced from this reaction.

Scientists have developed an explanation of a phenomenon from several verified hypotheses. the explanation has been confirmed through numerous experimental tests. which option best describes this explanation? a. scientific lawb. research questionc. hypothesisd. scientific theory