In a metal, the electrons are considered free because there are more electrons than there should be and also transition metals are willing to accept and give up electrons from their d-orbitals. The d-orbital shell are in a relatively high energy state which means they are loosely bound to the atom where they can freely move around.
Answer:
Take 102.16 and multiply by avogadros #
and you get 6.33 × 10^25 otherwise A
Answer:
4.29 g
Explanation:
The equation of the reaction is; Co(NO3)2(aq) + K2S(aq) → CoS(s) + 2KNO3(aq)
Number of moles of potassium sulphide = 175/1000 L * 0.225 M = 0.039 moles
Number of moles of cobalt (II) nitrate =250/1000 L * 0.180 M = 0.045 moles
Hence; potassium sulphide is the limiting reactant
Since the mole ratio is 1:1
Mass of solid product = 0.039 moles * 110 g/mol = 4.29 g
Answer:
0.3811 mol.
Explanation:
- To calculate the no. of moles of a gas, we can use the general law of ideal gas: <em>PV = nRT</em>.
where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
∵ P = 2.1 atm, V = 4.5 L, T = 302 K, R = 0.0821 L.atm/mol.K.
<em>∴ n = PV/RT </em>= (2.1 atm)(4.5 L)/(0.0821 L.atm/mol.K)(302.0 K) = <em>0.3811 mol.</em>
<u>8:4 and 4:8</u> both have CCP structure............................... ᐛ