Easy questions. Please help. Question 3 to 12.
Now that we understand the basics. Snape wants you to consider the following UNBALANCED equation: Al(s) + HCl (aq) rightarrow AlCl_3(aq)+H_2(g). Assume you have plenty of HC1 and 6.0 mole of Al. How many moles of H_2 are formed? Express your answer in moles. Let's try one more but add the theoretical yield concept. Consider the following UNBALANCED equation: NO(g) + H_2(g) rightarrow NH_3(g) + H_2O(g) If you start with 89.3 g NO(g) and 28.6 g H_2(g), find the theoretical yield of ammonia. Express your answer in grams. Ron Wesley isn't the best experimentalist. After an experiment, he ends up with only 3.10 g of product. However, the same reaction has is a theoretical yield of 3.50 grams of product. What is the percent yield? in attempts to lift Ron's spirits, Dumbledore asks him a fairly easy question: calculate the mass percent composition of carbon in C_2H_5Cl. Prof. Vitarelli thinks you should try this also. Ron was able to get the previous problem right! Hopefully so were you. Now, as a small extension to the previous problem Snape asks everyone to calculate the mass of chlorine in 21 kg of C_2F_3Cl_3. Express your answer in kg. Looking at the bottom of her tea cup, Prof. Trelawney suddenly has a revelation! She knows one of the previous exam questions! She bursts into the class and yells: Analysis of a sample is finds it contains 15.0% of species X, by mass. 75.0% of species Y, and 10.0% of species Z, by mass. the molar mass of species X is 45.0 g/mole, the molar mass of species Y is 150. g/mole, and the molar mass of species Z is 30.0 g/mol. If the molar mass of the sample is 1200 g/mole, what is the molecular formula of the sample? Prof. Vitarelli frowns at her disapprovingly. X_4Y_6Z_4 X_4Y_5Z_4 X_3Y_6Z_3 X_4Y_4Z_4 X_2Y_5Z_2 As a final problem for the week Snape thinks we should incorporate something from a previous week, hydrates perhaps. Suppose we have a compound that is 4.330 % Li, 22.10 % Cl, 39.89 % O, and 33.69 % H_2O. What is the compounds formula? LiClO_4 middot 3 H_2O LiCl_2O_3, middot 5 H_2O Li_2Cl_2O_3 middot 5 H_2O Li_2Cl_2O_3 middot 4 H_2O LiClO_3 middot 4 H_2O