Science is a continuous profession of study because new ideas are produced based on new evidence. Also, there are different topics of science such as climate change or new cures to different diseases.
Answer:
1.) 3
2.) 60 CM
Explanation:
1. Density==
2. Length*Width*Height=3*10*2
As the air molecules move through the valve they have friction as they hit the walls, and its this friction that causes it to heat up.
Molar mass Mg = 24.3 g/mol
1 mole mg ------------ 24.3 g
?? moles mg --------- 4.75 g
4.75 x 1 / 24.3 => 0.195 moles of Mg
hope this helps!