Tin (sn) exists in earth's crust as sno2. calculate the percent composition by mass of sn and o in sno2.

Sn = 78.77%

O = 21.23%

Explanation:

The atomic mass of Sn = 118.71 g/mol

The atomic mass of O = 16 g/mol

The molar mass of SnO₂ = atomic mass of Sn + 2 X atomic mass of O

The molar mass of SnO₂= 150.71

Now, in each mole of SnO₂ there is one mole of Sn and two moles of O

The mass of Sn in 150.71 g of SnO₂ = 118.71

Percentage of Sn in 150.71 g of SnO₂ =

% of Sn = %.

Rest will be O = 100-78.77 = 21.23%

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?