1. What is the density of a rock that has a mass of 243 g and a volume of 7.9 cm3?

Saltpeter is a compound made of potassium (K), nitrogen (N), and oxygen (O). Every 100.0g of saltpeter contains 38.67g potassium and 13.86g nitrogen. What is the mass of oxygen contained in 285.0mg of saltpeter? Answer needs to be in grams

The standard heat of combustion of ethanol, C2H5OH, is 1372 kJ/mol ethanol. How much heat (in kJ) would be liberated by completely burning a 20.0 g sample

Consider the reaction A ⟶Products Use the following rate data to determine the order of the reaction with respect to the reactant A. [A] (M) Initial Rate (M/s) 0.10 0.015 0.20 0.015 0 1 2 3

What is the group number of the alkali metals

If 22 mL of 0.137M MgCl2 is needed to completely react 15 mL of AgNO3 solution, what is the molarity of AgNO3?

Originally, the periodic table was arranged by increasing atomic radius increasing atomic mass increasing atomic number increasing number of electrons

How many moles are in 15.5-g SiO2

Is Oxygen - O2 a pure substance or a mixture?

What atom has 14 protons and 14 electrons

What is a diagram showing the forces acting on a coasting bike rider traveling at 25 km/h on a flat roadway