How many moles of MgCL2 are there in 311 g of the compound

Given the following dаta: 2O3 - > 3O2 (enthalpy = - 427 kJ) O2 - > 2O (enthalpy = + 495 kJ) NO + O3 - > NO2 + O2 (enthalpy = - 199 kJ) Calculate the enthalpy for the reaction NO + O - > NO2 using Hess's Law ...?

39 Which formula represents a molecule with the most polar bond? (1) CO (3) HI (2) NO (4) HCl

Helium decays to form lithium. 6 2 He → 6 3 Li + 0 -1 e This type of nuclear decay is called. its B on edge

Which contribution to the body of scientific knowledge is most recent? a) the development of the lever b) the confirmation of the double-helix structure of DNA c) the discovery of electricity d) the theory of evolution

Kevin is an oil engineer designing a new pipeline. In order to build the right diameter of pipe, what must he know about the oil they will be transporting through the pipeline?

At the same pressure, about 25 times more co2 will dissolve in plasma as o2. why does this occur?

Describe what occurs when a gas is collected by water displacement, including why a table of water vapor pressure values is needed.

The theory of plate tectonics

A sample of sodium reacts completely with 0.568 kg of chlorine, forming 936 g of sodium chloride. What mass of sodium reacted?

When do water molecule forms hydrogen bond with another water molecule which atoms are involved in the interation?