Hoà tan x gam NaCl vào 180g nước thu được dung dịch NaCl 10%. a) Tính khối lượng của NaCl đã pha.
b) Tính khối lượng dung dịch NaCl sau khi pha.

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c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.

the correct answer would be b) volume versus temperature, because they are also directly proportional.