Your friend sent you a 20.5 kg package how much will it weigh in pounds (1 pound = 0.453 kg)

How many electrons does strontium have to give up to achieve a noble gas electron configuration?

If the number of particles in a mole is 6.022x1023, what is the total mass of 1.81*1024 particles of nitrogen gas (N2) ? A. 42 g B. 4.2 g C. 84 g D. 8.4 g

Need it fast! Given the balanced equation below, calculate the moles of aluminum that are needed to react completely with 13.2 moles of FeO? You must show all of your work. 2Al+3FeO--> 3Fe+Al2O3

Calculate the density (in g/mL) of a liquid that has a mass of 0.115g and a volume of 0.000265 L

An atom has an atomic number of 9 a mass number of 19 and an electron configuration of 2-6-1 explain why the number of electrons in the second and third shells shows that this is in an excited state

Identify each enthalpy change by name and classify each change as exothermic or endothermic. 1. 1 mol NaCl (s) à 1 mol NaCl (l) 2. C4H10 O (l) à C4H10O (g) 3. H2O (g) à H2O (l) 4. 1 mol NaCl (s) + 3.

Calculate the number of atoms in a 1.26*103 g sample of silicon.

A region that has a large number of atoms whose magnetic fields are lined up parallel to a magnet's field is A. the magnetosphere. B. the magnetic declination. C. a magnetic domain. D. a ferromagnetic region.

Name the element that has atoms with the same electronic structure as sulfur ion

The mass of a 2.0 centimeter sample of a substance is 3.2 grams. Calculate the density of the substance