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kaheart [24]
3 years ago
12

calculate the volume of a rectangular prism with a length of 5.6cm, a width of 2.1cm, and a height of 6.6cm

Chemistry
2 answers:
Rus_ich [418]3 years ago
7 0
The volume of a prism is base times height so it should be 5.6 times 2.1 times 6.6 which gives us 77.616cm^3
dexar [7]3 years ago
3 0
To calculate the volume of a rectangular prism, use the formula: W x L x H So from your given measurement: 2.1 x 5.6 x 6.6 = 77.62 (rounded to nearest hundredth).
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Answer:

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Explanation:

To solve this question we need to calculate the heat absorbed by the cup calorimeter and by the water in the solutions. We will also need to calculate the amount in moles produced by the reaction since we want to know the ∆H°rxn in kJ/mol AgCl .

mol AgNO₃ = 100 mL x 1L/1000 mL x 0.100 mol/L = 0.01 mol

mol NaCl = 100 mL x 1L/1000 mL x 0.200 mol/L = 0.02 mol

Therefore our limiting reagent is the 0.01 mol AgNO₃ and 0.01 mol AgCl will be produced according to the stoichiometry of the reaction:

AgNO₃ + NaCl ⇒ AgCl + NaNO₃

Heat absorbed by the water:

qw = m(H₂O) x c x ΔT where  m (H₂O) = 200 g ( the density of final solution is  1  g/ml)

c = specific heat of water = 4.18 J/gºC

ΔT = change in temperature =  (25.30 - 24.60 ) ºC = 0.7ºC

qw = 200 g x 4.18 J/gºC x 0.7 ºC = 585.20 J

Heat Absorbed by the calorimeter :

q cal = C cal x  ΔT  = 15.5 J/ºC x 0.7ºC = 10.85 J

Total Heat released by the combustion = qw + qcal = 585.20 J +10.85 J

=  596.05 J

We have to change the sign to this quantity since it is an exotermic reaction  ( ΔT is positive ) and have the ∆Hrxn

∆H rxn  = -596.05 J  

but this  is not what we are being asked since this heat was released by the formation of  0.0100 mol of AgCl so finally  

∆H°rxn = -596.05 J /0.01 mol  = -59,605 J/mol x 1 kJ/1000J = -59.61 kJ/mol

5 0
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Answer:

The products have less potential energy than reactants.

Explanation:

For an exothermic reaction; the potential energy of the products is less than that of reactants.

Since, ΔH = Pot. energy of products - Pot. energy of reactants.

and it must be negative value.

The attached image shows also the potential energy diagram of an exothermic reaction.

So, the right choice is The products have less potential energy than reactants.

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Answer:

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Explanation:

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Answer:

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