The density of osmium is 22.57 g/cm^3. what is the mass of a block of osmium that measures 2.5cm x 1.6cm x 3.0cm?
a)12 cm^3
b)270 grams
c)0.53 grams
d)22.6 grams

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?

Type the letter that represents the correct location for each particle type below.

Consider the following reaction at equilibrium: c(s)+h2o(g)⇌co(g)+h2(g) predict whether the reaction will shift left, shift right, or remain unchanged upon each of the following disturbances. a) c is added to the reaction mixture. b) h2ois condensed and removed from the reaction mixture c) co is added to the reaction mixture d) h2 is removed from the reaction mixture.