Answer:
Mass = 235 g
Explanation:
Given data:
Mass of SiO₂ react = 352 g
Mass of silicon carbide formed = ?
Solution:
Chemical equation:
SiO₂ + 3C → SiC + 2CO
Number of moles of SiO₂:
Number of moles = mass/ molar mass
Number of moles = 352 g/ 60.08 g/mol
Number of moles = 5.86 mol
Now we will compare the moles of SiO₂ with SiC from balance chemical equation.
SiO₂ : SiC
1 : 1
5.86 : 5.86
Mass of SiC:
Mass = number of moles × molar mass
Mass = 5.86 mol × 40.11 g
Mass = 235 g
I believe <span>The liquid has strong cohesive forces.</span>
The first and the last choice is the same, aren't they?
Answer:
The correct answer is 1.21 L.
Explanation:
Based on the given information, the reaction will be,
CS2 (l) + 3Cl2 (g) ⇒ CCl4 (l) + S2Cl2 (l)
By using the standard values of the substances, the standard enthalpy of the reaction is,
ΔH° = [(-139.5) + (-58.5) – 0 – (87.3)] kJ/mol
= -285.3 kJ/mol
The amount of heat evolved for 3 moles of chlorine reacted us 285.3 kJ.
Now the number of moles of chlorine needed to react to produce 5.00 kJ is,
= 5.00 kJ × 3 mol Cl2/285.3 kJ
= 0.0526 mol Cl2
Now the volume of chlorine gas at 27degree C and 812 mmHg will be,
Volume = 0.0526 mol Cl2 × 0.0821 Latm/mol K × 300 K/ 1.07 atm
= 1.21 L
Iconic compounds are electrolytes because they dissociate into ions when dissolved in water. Many molecules compounds are noneelectrolytes
