Chemistry
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New answer posted
a year agoContributor-Level 10
Among isoelectronic monoatomic species, size is inversely proportional to atomic number. Hence among isoelectronic species Na? , O²? , N³? , F? (having the nearest noble gas configuration);
Order of size is Na? < F? < O? < N?
N³? has least atomic number hence the largest size
New answer posted
a year agoContributor-Level 10
nm = 2l + 1
As there are (2l + 1) number of permissible values of magnetic quantum number.
Hence, l = (nm - 1)/2
New answer posted
a year agoContributor-Level 10
An Atom has three fundamental particles-electron, proton and neutron. The mass of the electron is 9.10939 * 10? ³¹ kg. Neutrons and protons, both are collectively known as nucleons. All the isotopes of a given element show same chemical properties. Dalton's atomic theory, regarded atom as an ultimate particle of matter.
New answer posted
a year agoContributor-Level 10
20 g of 20% CaCO? = 20 * (20/100) = 4 g CaCO?
CaCO? (100 g) - (1200 K)-> CaO + CO? (44 g)
According to the reaction,
100 g of CaCO? → 44 g of CO?
4 g CaCO? → (4*44)/100 g of CO?
= 1.76 g of CO?
New answer posted
a year agoContributor-Level 10
ln K = ln A – (E? /R) (1/T)
In ln K v/s 1/T graph
Slope = –E? /R
–5 * 10³ = –E? /8.314
E? = 5 * 10³ * 8.314
= 41500 J mol? ¹ or 41.5 kJ mol? ¹
New answer posted
a year agoContributor-Level 10
H? O < H? S < H? Se < H? Te
Down the group acidic strength increases
So pK? value decreases
New answer posted
a year agoContributor-Level 10
For irreversible expansion of an ideal gas under isothermal condition
ΔU = 0, ΔS (Total) ≠ 0
New answer posted
a year agoContributor-Level 10
n (B) = 3/2
n (B) = 3, n (O) = 2
n (Total) = 3 + 2 = 5
X (B) = n (B) / n (T) = 3/5
X (O) = n (O) / n (T) = 2/5
P (S) = P° (B)X (B) + P° (O)X (O)
P (S) = 280 * (3/5) + 420 * (2/5)
= 336 mm of Hg
New answer posted
a year agoContributor-Level 10
n (O? ) = 4/32 = 1/8 mol
n (H? ) = 2/2 = 1 mol
n (Total) = n (O? ) + n (H? ) = 1/8 + 1 = 9/8 mol
PV = nRT
P (Total) * 1 = (9/8) * 0.082 * 273
P (Total) = 25.18 atm
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