What is the percent by mass of Water in CaSO4•2H20?

20.93%

Explanation:

The percent by mass (%mass) of water in the following compound can be calculated thus:

%mass of H2O = mass of 2H2O/mass of compound × 100

Where;

Ca = 40

S = 32

O = 16

H = 1

Hence, the molar mass of CaSO4•2H20 = 40 + 32 + 16(4) + 2{ 1(2) + 16}

= 40 + 32 + 64+ 2{18}

= 172g/mol

Molar mass of 2H2O = 2{2 + 16}

2(18)

= 36g/lol

Therefore, the percent by mass of 2H2O in CaSO4•2H20 is as follows:

36/172 × 100

= 0.2093 × 100

= 20.93%

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explanation:

why?

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answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

hope it