Electrons = protons
protons = atomic number
protons + neutrons = atomic mass
Therefore: a) protons + 7 = 15
protons= 15 -7
protons= 8
B) Remember proton = atomic number
so atomic number = 8
C)Now we know the atomic number so we can easily check on the periodic table what element has an atomic number of 8, which is Oxygen
Answer:
e.g converting 6.55×10^24 molecules of Sodium to moles.
We use Avogadro's number NA= 6.02×10^23 molecules.
Explanation:
Answer:
2.48626 x 10^24
Explanation:
We multiple 4.13 by avogadro's number to get that.
The flow rate of water differs from honey due to the texture and thickness of the product. Honey’s thickness doesn’t allow it to move as quickly as the water, therefore affecting the flow rate.
Answer:
The temperature is "298.51 K".
Explanation:
The given values are:
Density of ammonia,
d = 0.812 g/L
Pressure,
P = 1.17 atm
Mass:
M =
=
=
As we know,
⇒
∴
By putting the value of "W", get
On substituting the values in the above equation, we get