A. the constituents of air are in a fixed proportion by mass
B. it cannot be represented with a chemical formula
C. the constituents of air can be separated by physical means
D. none of the above
Correct Answer: Option A
A. the constituents of air are in a fixed proportion by mass
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![Water of mass 120g at 50°C is added to 200g of water at 10°C and the mixture is well stirred. Calculate the temperature of the mixture. [Neglect heat losses to the surrounding]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "Water of mass 120g at 50°C is added to 200g of water at 10°C and the mixture is well stirred. Calculate the temperature of the mixture. [Neglect heat losses to the surrounding]")