Change in velocity over time is acceleration.
You're finding acceleration .
The mass of oxygen and hydrogen must be equal to the mass of the substance they create the water. So if the hydrogen is 2.8 g the oxygen must account for the rest of the mass. Basically just subtract 25.4-2.8=mass of oxygen
Answer:
B
Explanation:
Because when you go to the doctors they say, "You need to get your x-rays done" not microwave
