LUOA chemistry semester exam review questions and answers 2024 with complete solution

LUOA chemistry semester exam review questions and answers 2024 with complete solution How many molecules are in 3.9 moles of water? - Answer ️️ -2.3 x 10^24 molecules of water How many moles are in 3.75 x 10^24 molecules of CO2? - Answer ️️ -6.23 moles How many moles are in 1.16 x 10^25 atoms of H2CO3? - Answer ️️ -19.3 moles of H2CO3 The molar mass of Cu(OH)2 is _________ grams per mole. (Hint: Answers might vary slightly, but should still fall within an acceptable range for the correct answer) - Answer ️️ -97.55 How many moles are in 132.3 grams of carbon dioxide? (Hint: Answers might vary slightly, but should still fall within an acceptable range for the correct answer) - Answer ️️ -3.007 moles How many grams are in 3.396 moles of Al2S3? (Hint: Answers might vary slightly, but should still fall within an acceptable range for the correct answer) - Answer ️️ -509.9 grams Calculate the mass of carbon in 250 g C2H6 - Answer ️️ -199.72 grams Calculate the mass of hydrogen in 250 g C2H6 - Answer ️️ -50.28 grams Calculate the mass of hydrogen in 250 g of C2H3O2 - Answer ️️ -12.83 grams Methyl acetate has a chemical composition of 48.64% carbon, 8.16% hydrogen, and 43.20 % oxygen. What is the empirical formula? - Answer ️️ -C3H6O2 A(n) __________formula is one that shows the lowest whole number ratio of the elements in a compound> - Answer ️️ -empirical If the empirical formula of a compound is C2OH4 and has a molar mass of 88 g/mol, what is its molecular formula? - Answer ️️ -C4O2H8 Write the formula for copper (II) sulfate hexahydrate. - Answer ️️ -CuSO4 ∙ 6H2O N2+ 3H2--> 2NH3 How many moles of ammonia are produced when 5 moles of hydrogen reacts with excess nitrogen? - Answer ️️ -3.3 mol N2+ 3H2--> 2NH3 In a certain reaction, 5.0 moles of hydrogen is reacted with excess nitrogen. To determine how many moles of ammonia (NH3) are produced based on the 5 mols of hydrogen, what conversion factor(s) should be used? (choose all that apply) - Answer ️️ -(2 mol NH3)/(3 mol H2) (3 mol H2)/(2 mol NH3) 2NO(g) + O2 (g) --> 2NO2 How many grams of NO are required to react fully with 5.00 mol of O2? - Answer ️️ -300 g 2 NO(g) + O2 (g) --> 2 NO2