Gypsum is a mineral that is used in the construction industry to make drywall (sheetrock). the chemical formula for this hydrated compound is cas04 • 2h20. a hydrated compound contains water molecules within its crystalline structure. gypsum contains 2 moles of water for each 1 mole of calcium sulfate.
what is the gram formula mass of caso4 • 2h2o?

The answer to your question is 172 g/mol

Explanation:

Data

                             CaSO₄ 2H₂O

Gram formula mass = ?

Process

1.- Determine the number of elements in the compound

    Calcium        1

    Sulfur            1

    Hydrogen          4

    Oxygen              6

2.- Multiply the number of atoms by their atomic weight

    Calcium        1  x 40 = 40

    Sulfur            1 x 32 = 32

    Hydrogen          4 x 1 = 4

    Oxygen              6 x 16 = 96

3.- Add the result

    Gram formula mass = 40 + 32 + 4 + 96

                                      = 172 g/mol

- both b and d.

-since b and d are the closest coastlines then that makes it the most affected.

< 3

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.