Imagine you are playing golf, and you’ve just set up the golf ball on the tee. You test your grip, take a few practice swings, and peer into the distance at the flag pole marking the first hole for the course. Your wise golf ball guru (who happens to also teach physics) tells you to “Be the ball, young grasshopper.” So you close your eyes and picture the distance the ball must travel. “Yes, young earthworm”, your sensei says, “that distance you see is the displacement you must achieve, displacement is the change in position from one place to another.”
You meditate on this nugget of wisdom, and you start to feel like you and the golf ball are one. But the hole still seems so far away: “How do I change the position of the ball, sensei?
Your sensei replies: “Ahh, the ball cannot simply teleport instantly, it requires velocity; you must change the position of the ball over time.”
In a brilliant burst of enlightenment, you know what you must do. The golf ball sits there minding its own business; with a velocity of 0, and it doesn’t have any plans on moving anytime soon until… WHACK! You hit that golf ball with your club and the ball goes flying through the air. Suddenly the ball is moving, and fast! You know you’ve made your sensei proud, the ball is being displaced, sailing from one position to another toward the hole, This change in position as time passes is what we call velocity.
The answer is d
Hope this helps
Moles of P = 56,4g/30,974g/mole = 1,82 moles P
moles of O = 43,6/15,999 = 2,73 moles of O
converting to the simplest ratio:
For P : 1,82/1,82 = 1
For O : 2,73/1,82 = 1,5
1 P and 2 oxygens.
PO2 -> the empirical formula
hope this help
When we look at the periodic table, it tells us the Sodium is labeled as 'Na'.
