Please help me find the 4 digit code! ive tried all the codes i can possible but none were correct

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

Select the correct answer. given: 2libr + ba → babr2 + 2li in this chemical reaction, 325 grams of barium (ba) react completely. how many moles of lithium (li) are produced? a. 1.18 mol b. 2.37 mol c. 4.73 mol d. 16.4 mol e. 32.9 mol

Determine the percent sulfuric acid by mass of a 1.61 m aqueous solution of h2so4. %