Determine the entropy change when 1.80 mol of HBr (g) condenses at atmospheric pressure?

There are two naturally occurring isotopes of copper. 63cu has a mass of 62.9296 amu. 65cu has a mass of 64.9278 amu. determine the abundance of each isotope.

What percentage of water vapour is in the air?

How do you use the periodic table to find the matter, number of subatomic particles, family name, reactivity, and number of valence electrons?

if scientist wants to retrieve the salt grom a sample of salwater, which of. the following should she do

Thomson suggested a plum pudding model of the atom. In this model A. the atom has a concentrated positively charged nucleus and electrons that move around it B. the atom has a cloud of positive charge with electrons randomly embedded in it C.

Molybdenum has a molar mass of 95.94g/mol. How many molecules of molybdenum are in 150.0 g of molybdenum

Describe a way that people might be able to solve each envioronmental problem listed below. coal mining can harm habitats and cause pollution.

A sample of methane gas occupies 4.50 gallons at a temperature of 80.0 F. If the pressure is held constant, what will be the volume of the gas at 100. degrees C?

Jack wants to know if it takes longer for warm water to freeze into ice cubes than cold water, so he performed the following experiment. Jack placed 50 mL of water in the refrigerator and allowed it to cool to a temperature of 4°C.

How to calculate average concentration