Answer : The excess reagent is,
Explanation :
First we have to calculate the moles of and .
Now we have to calculate the limiting and excess reagent.
The balanced chemical reaction is,
From the balanced reaction we conclude that
As, 1 mole of react with 1 mole of
So, 0.068 moles of react with 0.068 moles of
From this we conclude that, the moles of are less than the NaCl. So, is a limiting reagent because it limits the formation of products and is an excess reagent.
Hence, the excess reagent is,
The enthalpy change for dissolving this salt on a energy per mass is 136.32 J/g
Mass = Density × Volume
Mass of water = 1 × 75
Mass of water = 75 g
Q = MCΔT
Q = 77.5 × 4.184 × 0.93
Q = 301.5618 J
H = CΔT
H = 42.2 × 0.93
H = 39.246 J
Total heat = 301.5618 + 39.246
Total heat = 340.8078 J
ΔH = Total heat / mass
ΔH = 340.8078 / 2.5
ΔH = 136.32 J/g
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Answer : The enthalpy change for dissolving this salt on a energy per mass basis is 132.4 J/g
Explanation :
Heat released by the reaction = Heat absorbed by the calorimeter + Heat absorbed by the water
where,
q = heat released by the reaction
= heat absorbed by the calorimeter
= heat absorbed by the water
= specific heat of calorimeter =
= specific heat of water =
= mass of water =
= change in temperature =
Now put all the given values in the above formula, we get:
Now we have to calculate the enthalpy change for dissolving this salt on a energy per mass basis.
where,
= enthalpy change = ?
q = heat released = 331.08 J
m = mass of salt = 2.50 g
Therefore, the enthalpy change for dissolving this salt on a energy per mass basis is 132.4 J/g
To solve this we must be knowing each and every concept related to mass. Therefore, mass of KSO would you need to prepare 1500g of 5.0% KSO (m/m) solution is 75 g.
Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.
Mass of solution = 1500 g
5.0 % = 5.0 / 100 = 0.05
mass percentage = mass of solute / mass of solution
substituting all the given values in the above equation, we get
0.05 = mass of solute / 1500
mass of solute = 0.05 x 1500
mass of solute = 75 g of solute
Therefore, mass of KSO would you need to prepare 1500g of 5.0% KSO (m/m) solution is 75 g.
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The answer is: A) Yes, because the question is specific.
The scientific method is a process for experimentation that is used to explore observations (in this example color of snowshoe hares).
Steps of the scientific method:
1) ask a question about something that is observed.
2) do background research.
3) construct a hypothesis, an attempt to answer questions with an explanation that can be tested.
4) test of hypothesis.
5) analyze collected data and draw a conclusion.
The two main variables in an experiment are the independent and dependent variable.
Dependent variable is the variable being tested and measured in a scientific experiment, in this example lifespan of snowshoe hares.
Dependent variables depend on the values of independent variables. The dependent variables represent the output or outcome whose variation is being studied.
Answer:
A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.
Explanation:
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