Answer:
m=4 g Ca
M=ArCa+ArO=56 g/mol
Ca+O2-2CaO
nCa= m/M= 4/40=0.1 moles of Ca
the ratio of moles: 1 mole Ca:2 moles CaO
0.1 moles Ca =0.2 moles CaO
n=m/M
m=n×M
m=0.2×56=11.2 g CaO
Answer: 3p Orbitals
Explanation:
Electrons present in the 3p orbitals are farthest from the nucleus. Therefore, the electrons present in the 3p orbital will be shielded by the electrons present in the inner orbitals. Hence, 3p orbital in sulfur is most shielded from the nuclear charge".
Answer:
83°C
Explanation:
The following were obtained from the question:
M = 40g
C = 4.2J/g°C
T1 = 91°C
T2 =?
Q = 1300J
Q = MCΔT
ΔT = Q/CM
ΔT = 1300/(4.2x40)
ΔT = 8°C
But ΔT = T1 — T2 (since the reaction involves cooling)
ΔT = T1 — T2
8 = 91 — T2
Collect like terms
8 — 91 = —T2
— 83 = —T2
Multiply through by —1
T2 = 83°C
The final temperature is 83°C
Lower as KCl has ionic bonding which is less stable than CaCl2s covalent bond which requires less energy.
