Chemistry Answers

What is the change in energy of a system that requires 80 J of energy to do 150 J of work?

In a biochemical assay, a chemist needs to add 2.93 g of glucose to a reaction mixture. Calculate the volume in mL of a 1.35M glucose solution she should use for the addition.

The technologist in the STAT lab evaluates another problem sample. This specimen had a creamy tomato soup appearance in the heparinized whole blood specimen. The results of laboratory testing are listed below. Test Sodium Potassium Chloride Bicarbonate Anion gap Patient 135 mmol/L 3.6 mmol/L 99 mmol/L 24 mmol/L Reference-Ranges 136-145 3.5-5.1 98-107 22-28 10-20 16 1. If you are the Med. Tech. What result/s are erroneous Why? 2. What are the expected results of ALL the test? Enumerate and explain why 3. What will you do to correct the error? What method will you use if you decide to repeat the test? 

A second-order reaction of a form: 2 A → B reaches a conversion equal to X₁ = 0.99 in τ₁ = 7,91 h, at a temperature T₁ = 298 K. Calculate the temperature T₂ required to reach a conversion of X₂ = 0.995 in τ₂ = 1 h, with twice the initial concentration of reactant A. The activation energy of the reaction is E_A = 99600 kJ/mol. Universal gas constant: R = 8,314 J/(mol*K).

How many moles of NaOH are there in 1 kg of sodium hydroxide

find the number of millimoles of solute in:

a. 2.00 L of 2.76 x 10-3 M KMnO4

b. 250 mL of a solution that contains 4.20 ppm of CuSO4

Draw and name the product of reduction from 2-ethyl-3,4-dimethyloctanal + H

How many Na+ ions are contained in 4.62g Na3PO4?

When 10.0 g KOH is dissolved in 100.0 g of water in a coffee-cup calorimeter, the temperature rises from 25.18 0C to 47.53 0C. What is the enthalpy change in kJ per mole of KOH dissolved in the water? The specific heat capacity of water is 4.184 J/g0C

the loss of a positron by Yttrium-85