Chemistry Answers

Approximately 100 g of PbCl4 reacted excess NH4Cl according to the following equation: PbCl4 + 2 NH4Cl → (NH4)2PbCl6. If the yield was 87.0%, how many grams of product were obtained?

please include calculations

Q1. Catalase is an important enzyme that breaks down its substrate, H2O2, into water and oxygen in nearly all living cells. The enzyme has k2 = 1.1*107 sec-1 and Km = 2.0 mM. An experiment was set up under the conditions when the reaction rate is independent of [H2O2]. In this experiment, at what concentration of catalase (use SI units and scientific notation) will the reaction have a rate of 850 mM/min?

Q2. The degradation of ethyl acetate (EA) is a first order process with t1/2 = 110 min.

a) Fill in the blank: For this reaction, a graph of _______________ vs. time will give a straight line (linear plot).

b) What is the rate constant for the degradation of EA ?

c) What percentage of EA will remain after 440 minutes?

Imagine a protein molecule compose of 200 glycine molecules and 200 aspartic acid molecules describe how the protein is folded what is in this inside and what is in the outside

What is the mass percentage of O in C₃H₈O₂?

if you react 120g of c2h6 with 320g of o2 what is the limiting reagent?

1.   A balloon at a pressure of 5.0 atm contains helium and hydrogen. If the partial pressure of helium is 3.5 atm, what is the partial pressure of hydrogen?

4. What is the pH of a 0.350 M solution of lithium citrate? (Ka Citric Acid = 7.4 x 10-4

How many moles of KCl are produced from 2.50 moles K ?

When an electron is added to the valence shell

A sample of gas at 28.0 °C has a volume of 6.20 L and exerts a pressure of 720.0 mmHg. How many moles of gas are in the sample?