The study of plants, plant life cycles, photosynthesis, plant parts, etc. is under botany (study of plants).
Answer:
The partial pressure of helium gas in a gaseous mixture of helium and hydrogen is the pressure that the helium would exert in the absence of the hydrogen. equal to the total pressure divided by helium's molar mass. O equal to the total pressure divided by the number of helium atoms present.
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Answer:
1 is the same 3 is pure substance 4 is different
Explanation:
not sure about 2