What mass of sodium carbonate is required for complete reaction with 3.85 g of nitric acid to produce sodium nitrate, carbon dioxide, and water?

A binary compound created by reaction of antimony and an unknown element E contains 60.51% Sb and 39.49% E by mass. If the formula of the compound is Sb2E5, calculate the atomic mass of E.

2.560 g of an unknown compound containing C, H, and O is found through combustion analysis to produce 4.924 g CO2 and 1.728 g H2O. What is the empirical formula of the compound? Show all steps. Hint: recall that combustion analysis assumes the mass (and moles) of each element is conserved throughout the reaction. Molar masses: CO2 = 44.01 g/mol; H2O = 18.02 g/mol

How many moles of oxygen gas must react completely to produce 1.57 moles of carbon dioxide according to the reaction:                                C3H8 + 5 O2  --> 3CO2 + 4H2O? Group of answer choices 0. 942 mol 2.62 mol 1.57 mol 4.71 mol 0.314 mol