How many moles are equal to 1.2 x 10^21 molecules of lithium?

a) 7.2 x 10^44 moles

b) .2.0 moles

c) 7.2 x 10^24 moles

d) 2.0 x 10^-3 moles

Why is retrograde motion an apparent motion

Use the drop-down menus to label each of the following changes p for physical change and c for chemical change. the substance changes to a new substance. the original substance can be recovered. the color changes. gas is produced and given off. the substance changes size, shape, or volume.

For the reaction i2(g)+br2(g)←−→2ibr(g), kc=280 at 150 ∘c. suppose that 0.450 mol ibr in a 2.00-l flask is allowed to reach equilibrium at 150 ∘c. what is the equilibrium concentration of 2ibr, i2, br2