General Chemistry Answers

When copper is heated with an excess of sulfur, copper(I) sulfide is formed. In a given experiment, 0.0970 moles of copper was heated with excess sulfur to yield 2.98 g copper(I) sulfide. What is the percent yield?

In concentration of Aqueous solutions find Volume fraction and Mole Fraction using the Mass fravtion of 0.5702, Specific Gravity of solute of 0.3662 and molecular weight of solute of 101.0

A system releases 187 kJ of heat and its internal energy change was -441 kJ. How much work (in kJ) did it do on the surroundings?

When a clam forms its shell, it creates calcium carbonate from other chemicals available in its surroundings. Assume the equation of this process corresponds to the following reaction:

 CO2(g) + Ca(OH)2(s) → CaCO3(s) + H2O(l)

 If the enthalpy change of this reaction is -114.73 kJ mol-1, what can be said about the flow of heat during the process?

Question options:

a) Heat will absorbed by the clam from its surroundings, causing the water to cool

b) None of the above.

c) No heat is released since it takes place in water.

d) The enthalpy change is converted to work by building the shell.

e) Heat will be released by the reaction, eventually flowing from the clam to its surroundings.

In order to determine Ccal for a brand new calorimeter, a test reaction that is known to release 6.0 kJ of heat is carried out. The reaction causes a temperature increase of 3.7^oC. What is the heat capacity of the calorimeter (in kJ/^oC)?

A drone has a frequency of 2.71 GHz (gigahertz). What wavelength is associated with this frequency? 

is sulfur soluble in water

1. How many atoms of oxygen are there in 4.54 x 1022 formula units of Ba(NO3)2?

What is the correct formula for rho (III) alysivate?