hello! can someone help with a lab report. ( pink post it has information from experiment)

Chemical Reaction between Tin and Nitric Acid Name: Lab Partneris): Date Conducted: QUESTIONS: 1 a) From the mass of the tin and the mass of the tin oxide, calculate the mass of the oxygen that combined with the tin. b) From the masses of the tin and oxygen, calculate the number of moles of each. c) Express the compound's empirical formula as Sn:Ox, where x is expressed to 3 significant figure e., SnO2.34. d) Round x to the nearest Integer. e) Calculate the percent error of x from the integer. Petridish- 85.969 Tin - 1.000 g crucible 24,219 tin oxide-.71 2. Using experimental masses, calculate the percent by mass of tin and oxygen in the sample. 3. Remember that the nitric acid in water is H) and NO (O). The brown gas evolved is an oxide of nitrogen, which can be identified by the description of the nitrogen oxides in the CRC Handbook, in the "Table of Physical Constants of Inorganic Compounds." No atmospheric Oz is involved in this experiment. List at least four different oxides of nitrogen and circle the one you observed during your reaction. 4. Write a balanced equation for the reaction between tin and nitric acid. 5. Discuss possible sources of error. On the basis of your experiment, determine which errors are applicable. That is, if your result is too high, do not suggest an error that leads to a low result