The number in isotope platinum-194 stands for the <em>total </em>amount of protons and neutrons. In other words, this is the mass. =)
A bike rusting is an example of a chemical
change since rusting is a chemical reaction. New substances are formed from
this reaction. On the other hand, other choices given are just physical changes
because only the shape or the physical form of the substances are being
changed. An example of a physical change is cutting a paper.
Answer:
Actual velocity of the ping-pong ball= 5 m/s
Explanation:
velocity of ping pong ball because of the shot gun= 4 m/s North
velocity added to the ping-pong ball due to the wind=3 m/s
These velocities are perpendicular to each other. so we use Pythagoras theorem to find the resultant velocity of the ping- pong ball
so the actual velocity of the ping-pong ball =V= √4²+3²
V= √25
V= 5 m/s
Explanation:
WANNA TALK ON PADLET BOY
Answer:
mass molar of gas (Mw):
Mw = 107 g/mol
Explanation:
∴ m gas = 3.82 g
∴ V gas = 0.854 L
∴ T = 302 K
∴ P = 1.04 atm
ideal gas:
∴ n = m / Mw
⇒ PV = RTm/Mw
⇒ Mw = RTm / PV
⇒ Mw = ((0.082 atm.L/K.mol)*(302 K)*(3.82 g)) / ((1.04 atm)*(0.854 L)
⇒ Mw = 106.51 g/mol ≅ 107 g/mol
Which number do you need to know
