Answer:
100.71 cm H2O
Explanation:
In a fluid column barometer, the height of the fluid column is proportional to the pressure. The pressure is by definition:
, where F is a force and A is the area.
In a column barometer the force is given by the weight of the fluid:
, and the mass may be expressed as
, where
is the density and V is the volume.
Replacing this in the pressure definition:

In a constant cross section area column, the volume may be calculated as:
where A is the area and h the height. Replacing this in the previous equation:

Different columns may be over the same pressure, so:

Dividing each part for gravity constant:

And isolating hw:
mm
It is equal to 1007,1 cm.
Answer:
There is 61.538% oxygen in Al2(SO4)3.
Explanation:
Wt Of oxygen in the compound = 12*16 = 192 amu.
Total Wt. Of the compound = 2*12+3*32+12*16 = 312 amu.
Thus, percent of oxygen = Wt of oxygen/total Wt. Of compound *100
= 192/312 * 100=61.538 %