How many atoms are there in 90.2 grams of selenium?

What is the [H+] of a solution with a pH of 5.6

How many molecules are in 128g of H2O?

A bag of potato chips contains 585 mL of air at 25°C with a pressure of 765 mm HG. What will be its volume at the top of the mountain where the pressure is 442 MM Hg and the temperature is 5.0°C

What mass of iodine would react with 48 grams of magnesium to make magnesium iodide? Mg + I2 - > MgI2

What is empirical and moleculer formula?.

Hemoglobin, a protein in red blood cells, carries o2 from the lungs to the body's cells. iron (as ferrous ion, fe2+) makes up 0.33 mass % of hemoglobin. if the molar mass of hemoglobin is 6.8 Ã 104 g/mol, how many fe2 + ions are in one molecule?

What could you predict about a methane molecule that would most likely be made by using both the quantum model of the atom and John Dalton's model?

What is the molar mass of an unknown hydrocarbon whose density is measured to be 1.97 g/l at stp?

Which is an example of flow of heat through conduction

Which of the following is an extensive physical property of matter? volume viscosity odor density