Answer:
its d, forming a hypothesis is always one of the first things you do, and d is the best answer from these 4
The correct answer is C - sound.
Sound is a wave, and it is thus not considered a form of matter.
Mole number of 75 g is 0.4 mol. NO2 is 0.8 mol and is 36.8 g.
Answer: sum of the pressure of the two gases present.
Explanation:
According to Dalton's law, the total pressure of a mixture of gases is the sum of individual pressures exerted by the constituent gases.
For example if there are there are two gases hydrogen and oxygen with individual pressure of 30 and 20 atm each. Then the total pressure in the container will be:
Thus

Thus if two gases are present in a container, the total pressure in the container is equal to sum of the pressure of the two gases present.
The answer would be D.) convex