A) what is the mass in grams of a sample of manganese (ii) phosphite containing 7.23 x 10^22 phosphite ions?

b) determine the percent composition (by mass) for each element in ammonium dichromate (nh4)2cr2o7

c) a compound with a molecular mass of 202.23g/mol was found to have the following mass percent composition: 95.02% carbon and 4.98% hydrogen. determine its:

*empirical formula

*molecular formula

Explanation:

a) Manganese (II) phosphite :

Number of phosphite ions in manganese (II) phosphite =

In one molecule of manganese (II) phosphite there are 2 ions of phosphite.

Then ions of phosphite will be ions will be in:

Moles of manganese (II) phosphite;=

Mass of 0.2401 mol of Manganese (II) phosphite :

0.2401 mol × 322.75 g/mol = 77.49 g

77.49 is the mass in grams of a sample of manganese (II) phosphite.

b) Molar mass of ammonium chromate =252.07 g/mol

Percentage of Nitrogen:

Percentage of hydrogen:

Percentage of chromium:

Percentage of oxygen:

c) Molar mass of the substance = 202.23 g/mol

Percentage of the hydrogen = 4.98 %

Let the molecular formula be

Percentage of the carbon = 95.02 %

x= 16.01 ≈ 16

Percentage of the hydrogen= 4.98 %

y= 10.07 ≈ 10

The molecular formula of the substance is .

The empirical formula of the substance is .

i think a, hope it .

explanation:

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.