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Example:
Decomposition of mercuric oxide HgO to mercury Hg and oxygen O2 gas, requires
87.1kJ of heat,
HgO(s) Hg(l) + O2(g) ΔH = + 87.1kJ (needs to absorb energy)
1. Combustion of hexane, C6H12 to carbon dioxide gas and water, releases 3923.9kJ
of heat.
2. Reaction between solid phosphorous, P4 and oxygen gas, produces P3O6 and
1640.1kJ of heat.
3. One mole ammonium nitrate (NH4NO3) dissolves in water to produce aqueous
ammonium ions and nitrate ions accompanied by the absorption of 28.1 kJ of heat.
4. Formation of carbon dioxide gas from carbon (graphite) and oxygen yields 393.5
kJ of heat.
Please solve it like this
1. Answer
2. Answer
3. Answer
4. Answer
1.) Calculate ΔE if 120kJ of heat energy is absorbed by the system and 40kJ of work
is done on the surroundings.
2.) Find ΔE when a gas absorbs 30kJ of hear and has 15kJ of work done on it.
3.) If the internal energy of a reaction is 480J and the system absorbs 839J of heat
from it’s surrounds,
a. Find the amount of work.
b. Is the work done by the system or work is done on the system? Explain.
Please solve it like this
1. SOLUTION
2. SOLUTION
3.A.SOLUTION
B. EXPLAIN
2. A solution was produced by dissolving 3.75 g of a nonvolatile solute in 95g of
acetone. The boiling point of pure acetone was observed to be 55.95 ºC, while the boiling
point of the solution was 56.50ºC. If the boiling point for acetone is 1.71ºC/m, what is the
approximate molar mass of solute?
Step 1: First compute the molality of the boiling point equation.
Step 2. Then, from the definition of molality, compute the number of moles
solute, n(solute), in the sample.
Step 3. Solve for the molar mass.
Please solve it like this
STEP1: SOLUTION
STEP2: SOLUTION
STEP3: SOLUTION
THANK YOUUU
1. A solution containing 4.50 g of a non electrolyte (i=1) dissolved in 125 g of water
freezes at -0.372ºC. Calculate the molar mass of the solute.
Step 1: First compute the molality of the freezing point equation.
Step 2. Then, from the definition of molality, compute the number of moles
solute, n(solute), in the sample.
Step 3. Solve for the molar mass.
Please solve it like this
STEP1: SOLUTION
STEP2:; SOLUTION
STEP3: SOLUTION
5.Which is better emulsifying agent, soap and detergent? Explain.
give me some reference about my question
Which oil is more unsaturated and has the higher melting point, safflower oil or olive oil? Explain.
The melting point of stearic acid is 70°C, and the melting point of oleic acid is 4°C. Explain in detail why their melting points are so different.
Write the equation for... and explain the reaction of the following.
a.The preparation of soap from stearic acid and NaOH.
b.The reaction of magnesium ions with sodium stearate.
Why is it that phosphoglycerides are found in cell membranes?
Calculate the concentration in mol dm–3 and g dm–3, of a sodium ethanedioate (Na2C2O4) solution, 5.00 cm3 of which were oxidized in acid solution by 24.50 cm3 of a potassium manganate(VII) solution containing 0.05 mol dm–3.
