Answer:
Explanation:
As energy is absorbed therefore it is an endothermic reaction. Hence energy value should be written in the product side with a negative sign.
Reaction: 
C balance: 
H and O balance: 
Here 2 moles of 
react. So, energy absorbed during the reaction is 
kJ or 46.6 kJ
Energy balance:
Balanced thermochemical equation:
Answer:
The open system evaporates the solvent in the solution
Explanation:
An open system is a system in which exchange of materials and energy can occur. If a TLC set up is left open, then the set up constitutes an open system.
During TLC, the sample is dotted on the plate and inserted into a suitable solvent. The solvent moves up the plate and achieves the required separation of the mixture.
Most of these solvents used used TLC are volatile organic compounds. Therefore, if the TLC set up is left open, the solvent will evaporate leading to poor results after running the TLC experiment.
Density is equal to the ratio of mass to the volume.
The mathematical expression is given as:
Density of silver metal bar=
Convert 
into g/L
= 0.001 L
Thus, density = 
= 
Volume = 0.5 L
Put the values,
=
Now, convert gram into kg
1 g = 0.001 kg
Therefore, mass in kg= 
= 5.25 kg
Thus, mass of silver metal bar in kg=5.25 kg
Answer:
Explanation:
2 H₂(g) + O₂(g) → 2 H₂O(g
2 moles 1 mole 2 mole
50 g of H₂ = 50 /2 = 25 moles of H₂
100 g of O₂ = 100 / 32 = 3.125 moles of O₂
So oxygen is the limiting reagent .
3.125 moles of O₂ will react with 6.25 moles of H₂ to give 6.25 moles of H₂O .
Hence moles of H₂O produced = 6.25 moles .
Answer:
ions are surrounded by hydrogen ends with positive partial charge. In this way the salt is dissolved in water. Sugar is a molecular compound formed by covalent bonds. In a polar covalent bond, electrons are shared unevenly
Explanation:
