Can someone help me with this I’m trying to review for my test but still don’t understand how to to this, thank you! In this lab, you will be determining the mass percent of copper in a sample of brass. You will first be adding nitric acid to the brass, which will react with the copper and the zinc in the brass sample (thus dissolving it). This results in a colorless solution of zinc nitrate and a deep blue solution of copper(II) nitrate. The equation for the formation of copper(II) nitrate is shown below.

Balanced molecular equation: 4 HNO3(l) + Cu(s) → Cu(NO3)2(aq) + 2 NO2(g) + 2 H2O(l)

Balanced net ionic equation: 4 H+(aq) + 2 NO3–(aq) + Cu(s) → 2 NO(g) + 2 H2O(l) + Cu2+(aq)

Assuming you start with a 2g sample of brass and assuming your brass sample is 100% copper, calculate the minimum volume (in mL) of concentrated 15.8M HNO3(aq) that needs to be added to react completely with the brass (assumed to be 100% copper for now). Note: the moles of H+(aq) represent the moles of HNO3(aq) reacted in the balanced equation above.

Actual ingredients of lab (the cookies i am actually making) 1/2 cup sugar 1/2 cup brown sugar 1 1/3 stick margarine 1 egg 1/2 tsp salt 1 tsp vanilla 1/2 tsp baking soda 1 1/2 cup flour 1 1/3 cup chocolate chip can you answer the questions below ? discussion 1. suppose you are given the following amounts of ingredients: 1 dozen eggs 24 tsp. of vanilla 1 lb. (82 tsp.) of salt 1 lb. (84 tsp.) of baking soda 3 cups of chocolate chips 5 lb. (11 cups) of sugar 2 lb. (4 cups) of brown sugar 1 lb. (4 sticks) of margarine a. for each ingredient, calculate how many cookies could be prepared if all of that ingredient were consumed. (for example, the recipe shows that using 1 egg- with the right amounts of the other ingredients- yields 24 cookies. how many cookies can you make if the recipe is increased proportionately for 12 eggs? ) b. to determine the limiting reactant for the new ingredients list, identify which ingredient will result in the fewest number of cookies. c. what is the maximum number of cookies that can be produced from the new amounts of ingredients?

How much energy is made when a pice of wood burns. how do you know

The rate constant for the reaction below is 6.2 x 10−5 mol l−1 s −1. if the initial concentration of a is 0.0500 m, what is its concentration after 115 s?