If you wanna know density then:
Density = mass/volume = 16.31/8.29 = 1.96 g/mL.
Hope this helps!
Answer:
a) ΔU = 370 KJ
b) Endothermic
Explanation:
a)
The change in energy of the mixture can be given by first law of thermodynamics as:
ΔQ = ΔU + W
ΔU = ΔQ - W
where,
ΔQ = change in heat energy of system
ΔU = Change in internal energy of gases
W = Work done on gases = - 155 KJ
For an isobaric process (i.e constant pressure) we know that:
ΔQ = change in enthalpy = ΔH
ΔQ = 215 KJ
Therefore, using values in the equation, we get:
ΔU = 215 KJ - (-155 KJ)
<u>ΔU = 370 KJ</u>
b)
Since, the enthalpy of products is greater than the reactants. Therefore, this is an <u>endothermic reaction</u>.
Answer:
A: heat energy
Explanation:
because as we light up the bulb it gives us light energy
but when we touch it we feel that it is hot (heat energy)
the heat energy given of is not for our use and goes to waste
The mass of required will be 0.6075 g.
Calculation of mass:
The reaction:
Volume of = 75 mL
Concentration of = 0.100 M
Step 1:
Molarity is moles of solute in 1000 mL of the solution.
Moles of = 0.0075
Step 2:
From the above equation,
2 moles of is precipitated by 1 mole of
So, 0.0075 moles will be precipitated by-
moles of
= 0.00375 moles of
Step 3:
Molar mass of = 162 g/mol
So, Mass of required will be 0.6075 g.
Learn more about Dilution factor here:
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