Calculate the wavelength (in nm) of the light emitted by an LED with a frequency of 2.82 × 1015 s-1. Show your work for this problem. Right after submitting your exam, upload your photos to the Assignment Box, “Calculations for Exam 5”

Which of the following (if any) are not financial intermediaries?

There are ________ C atoms in 1.00 mol of C2H6.

There are __________ atoms of potassium are in 0.250 mol of potassium carbonate, K2CO3?

Free Response Question 4: Aqueous silver nitrate reacts with aqueous magnesium iodide to form solid silver iodide and aqueous magnesium nitrate. Write a complete and balanced chemical reaction. Include the phases for each compound. If the solutions contained 50.0 grams of silver nitrate and 50.0 grams magnesium iodide, determine which reactant is the limiting reactant and how many grams of precipitate are produced (In other words, what is the theoretical yield of the precipitate)? A student carried out the experiment and produced 48.3 grams of the precipitate. Calculate the percent yield for the experiment.

If you want to produce 1.80 g of water using the equation below, how many grams of hydrogen are needed? 2H2 + O2 → 2H2O

Free Response Question 1: Determine the limiting reactant and theoretical yield of HCl if 60.0 g of BCl3 and 37.5 g of H2O are reacted according to the following balanced reaction. Reaction: BCl3(g) + 3 H2O(l) → H3BO3(s) + 3 HCl(g) Enter your answers below. Include proper significant figures and units for your answers. Show your work and answers for this problem on your scratch paper. Upload the scratch paper within 30 mins of completing the exam.

Free Response Question 3: Use the reaction below to answer the following questions: Reaction: 2 C4H10 + 13 O2 → 8CO2 + 10 H2O    ΔH = -5755 kJ Is the reaction exothermic or endothermic? How much heat is produced when 3.25 moles of C4H10 (butane) react completely? How many grams of butane are needed to produce 9750 kJ of heat? Enter your answer for parts A-C below. Include proper significant figures and units for your answers. Show your work and answers for this problem on your scratch paper. Upload the scratch paper within 30 mins of completing the exam.

Classify the following reaction type: A + BC

Use the solubility rules below to determine if the following compounds are soluble or insoluble.