Amixture of fe2o3 and feo was found to contain 72.00% fe by mass. what is the mass of fe2o3 in 0.0493 g of this mixture?

The amount of found in the mixture of and is 72.00 %. (Given)

So, in total mixture as 100%, 72.00 % of is present.

Molecular weight of =

Molecular weight of =

Weight of mixture =

Therefore, of mixture contains of .

So,

That means of mixture contains of

So, of contains .

Hence, the mass of in of this mixture is .

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

answer: a tank of height h is filled with water and sits on the ground. water squirts from a hole at a height y above the ground and has a range r. for two y values, 0 and h, r is zero. determine the value of y for which the range will be a maximum.

explanation: