How many atoms are in 1.4 mol of phosphorus trifluoride (PF3) ?

a. 8.4 * 1024

b. 3.4 * 1023

c. 8.4 * 1023

d. 3.4 * 1024

What is the mass of ammonium nitrate in 250 mL of a 75% by mass solution (density = 1.725 g/mL) ?

If an object has a volume of 5 mL and a mass of 50 g, what is the density of the object? 0.10 10 40 250

Which statement is true regarding main group families of the periodic table? A) Argon is a noble gas that gains 1 electron to become an anion to become stable. B) Flourine is a chalcogen that gains 1 electron to become an anion to become stable.

How many electrons does the isotope oxygen-18 have? 6 8 10 18

The change in energy needed to change the state of a substance is

Ionic bonds are strong; therefore, ionic compounds

A cells that carry information through tour nervous system

True or False: According to the present atomic theory, the location of an electron in an atom is best represented by a probability cloud.

How can we measure the density of different wooden objects

According to molecular orbital theory, all diatomic molecules with an even number of electrons will be diamagnetic. True or False?