Answer: The correct option is D.
Explanation: Nonmetallic minerals are the chemical elements from which no new product can be formed when they are melted. For Example: Sand, marble etc..
For the given options:
Option A: Wood is a type of cellulose and is not considered as a nonmetallic mineral resource.
Option B: Iron is an element because it is the smallest substance which cannot be broken down. It is not considered as a nonmetallic mineral resource.
Option C: Coal is a mixture of carbon compounds. This is very close to mineral but is an organic mineral because it contains carbon atom. Hence, it is not considered as a nonmetallic mineral resource.
Option D: Aggregate is formed by the collection of particles forming a whole mass. This is a non-metallic resource as it cannot form any new product.
Hence, the correct option is D.
Answer:
ΔH = - 2020.57 kJ/mol
Explanation:
Given that :
mass of propanol = 1.685 g
the molar molar mass = 60 g/mol
Thus; the number of moles = mass/molar mass
= 1.685 g/60 g/mol
= 0.028 g/mol
However ;
ΔH = heat capacity C × Δ T
Given that:
The temperature increases from 298.00 K to 302.16 K.
Then ;
Δ T = 302.16 K - 298.00 K
Δ T = 4.16 K
heat capacity C = 13.60 kJ/K
∴
ΔH = 13.60 kJ/K × 4.16 K
ΔH = 56.576 kJ
The equation of the given reaction can be represented as :
![C_3H_7OH_{(l)}+\dfrac{3}{2}O_{2(g)} \to 3CO_{2(g)} +4H_2O_{(l)}](https://tex.z-dn.net/?f=C_3H_7OH_%7B%28l%29%7D%2B%5Cdfrac%7B3%7D%7B2%7DO_%7B2%28g%29%7D%20%20%5Cto%203CO_%7B2%28g%29%7D%20%2B4H_2O_%7B%28l%29%7D)
Thus for 0.028 mol of heat liberated; ΔH = 56.576 kJ
For 1 mole of heat liberated now:
ΔH = 56.576 kJ/0.028 mol
ΔH = 2020.57 kJ/mol
SInce , Heat is liberated, the reaction undergoes an exothermic reaction thus;
ΔH = - 2020.57 kJ/mol
Answer:
The atomic mass of Zinc is 65.30 Da
Explanation:
<u>Step 1: </u>Data given
3 major isotopes
⇒ Zinc-64
atomic mass = 63.929 Da
Peak intensity = 100
⇒ Zinc-66
atomic mass = 65.9260 Da
Peak intensity = 57.4
⇒ Zinc- 68
atomic mass = 67.9248 Da
Peak intensity = 38.6
<u />
<u>Step 2:</u> Calculate the natural abundance
∑peak intensity = 100 + 57.4 + 38.6 = 196
Zinc-64 : 100/196 = 0.5102 ⇒ 51.02 %
Zinc-66 : 57.4/196 = 0.2929 ⇒ 29.29 %
Zinc-68 : 38.6/196 = 0.1969 ⇒ 19.69 %
<u>Step 3:</u> Calculate the atomic mass if Zinc
63.9291 * 0.5102 + 65.9260*0.2929 + 67.9248*0.1969 = 65.3007 Da
The atomic mass of Zinc is 65.30 Da
Colligative properties of solutions are properties that depend upon the concentration of solute molecules or ions, but not upon the identity of the solute. Colligative properties include freezing point depression, boiling point elevation, vapor pressure lowering, and osmotic pressure.
Hope this helps