In June 2024
Search & Filtering
Camphor is a white solid that melts at 179.5°C. It has been used to determine the molecular weights of organic compounds because of its unusually large freezing-point-depression constant (40°C/m), which allows ordinary thermometers to be used. The organic substance is dissolved in melted camphor, and then the melting point of the solution is determined.
How many grams of NaOH are in 3 liters of a 1M solution of the NaOH?
A sample of amoxycillin was taken for analysis. It was treated so that all the nitrogen was converted to nitrogen dioxide, NO2(g). The mass of NO2(g) was determined to be 0.364 g.
What volume of hydrogen sulfide gas is formed at 0°C and 100 kPa when 1.24g iron(II) sulfide is reacted with 30 mL of 1.04 mol L^-1 hydrochloric acid solution? Iron(II) chloride is the other product.
Answer is 0.32 L (2 sf)
A calorimeter is calibrated by mixing 5.00mL of 0.250M HCI and 5.00mL of 0.250M NaOH. A temperature rise of 14.26°C was recorded. Using the same calorimeter, 1.25mL of 0.500M temperature rise of 3.35°C, what is the enthalpy of neutralization of the reaction
A student was asked to determine the enthalpy of a reaction of NH4NO3 in water using a coffee cup calorimeter. The heat capacity of the calorimeter, Ccal, was determined to be 64.17 J/°C. If 1.33×10 mol is dissolved in excess water, the temperature drops from 29.0 to 25.0°C. What is the enthalpy of dissolution of the ammonium salt in J/mol? Assume that all NH4NO3 dissolved in water.
What weight of anhydrous MnCl2 could be obtained from this reaction
Z 79 97 46 111 101
NUM. OF PROTONS 106 92 51 41
NUM. OF NEUTRONS 150 169 71 170 157
MASS NUMBER 197 269 278 238 106 93
ISOTOPIC SYMBOL
NAME OF ELEMENT
- Calculate the amounts of solids Na2HPO4 and NaH2PO4 needed to prepare 0.40 M, 1.5L of phosphate buffer with pH of 7.0.
Write the expression for the equilibrium constant, for the following reaction: A (g) + 2B (aq) → 3C (s) + 4D (g)
-
![Help me with my assignment!]()
Who Can Help Me with My Assignment
There are three certainties in this world: Death, Taxes and Homework Assignments. No matter where you study, and no matter…
-
![How to finish assignment]()
How to Finish Assignments When You Can’t
Crunch time is coming, deadlines need to be met, essays need to be submitted, and tests should be studied for.…
-
![Math Exams Study]()
How to Effectively Study for a Math Test
Numbers and figures are an essential part of our world, necessary for almost everything we do every day. As important…
