question 1
Knowing that the atomic mass of magnesium is equal to 24 u, determine the mass, in grams, of an atom of this element. (Given: Avogadro's number = 6.0. 1023).
a) 24 g.
b) 4.0 g.
c) 24. 10-23 g.
d) 4.0. 1023 g.
e) 4.0. 10-23 g.
question 2
Consider a glass that contains 180 mL of water. Determine, respectively, the number of moles of water molecules, the number of water molecules and the total number of atoms (Atomic masses = H = 1.0; O = 16; Avogadro's number = 6.0. 1023; density of water = 1.0 g/ml).
a) 10 mol, 6.0. 1024 water molecules and 18. 1024 atoms.
b) 5 mol, 6.0. 1024 water molecules and 18. 1024 atoms.
c) 10 mol, 5.0. 1023 water molecules and 15. 1024 atoms.
d) 18 mol, 6.0. 1024 water molecules and 18. 1024 atoms.
e) 20 mol, 12. 1024 water molecules and 36. 1024 atoms.
More questionsWatch our video class to learn a little more about Campo Geral, a novel by Brazilian writer João Guimarães Rosa. Check out our review!
A normal is a reaction force that a surface produces when it is compressed by some body or object. In today's video lesson, we'll learn about defining normal force and how to calculate it.
