What problem can fossil fuel create for life on earth?

1.00 kg of ice at -10 °C is heated using a Bunsen burner flame until all the ice melts and the temperature reaches 95 °C. A) How

BaLLatris [955]

Answer : The energy required is, 574.2055 KJ

Solution :

The conversions involved in this process are :

$(1):H_2O(s)(-10^oC)\rightarrow H_2O(s)(0^oC)\\\\(2):H_2O(s)(0^oC)\rightarrow H_2O(l)(0^oC)\\\\(3):H_2O(l)(0^oC)\rightarrow H_2O(l)(95^oC)$

Now we have to calculate the enthalpy change or energy.

$\Delta H=[m\times c_{p,s}\times (T_{final}-T_{initial})]+n\times \Delta H_{fusion}+[m\times c_{p,l}\times (T_{final}-T_{initial})]$

where,

$\Delta H$ = energy required = ?

m = mass of ice = 1 kg = 1000 g

$c_{p,s}$ = specific heat of solid water = $2.09J/g^oC$

$c_{p,l}$ = specific heat of liquid water = $4.18J/g^oC$

n = number of moles of ice = $\frac{\text{Mass of ice}}{\text{Molar mass of ice}}=\frac{1000g}{18g/mole}=55.55mole$

$\Delta H_{fusion}$ = enthalpy change for fusion = 6.01 KJ/mole = 6010 J/mole

Now put all the given values in the above expression, we get

$\Delta H=[1000g\times 4.18J/gK\times (0-(-10))^oC]+55.55mole\times 6010J/mole+[1000g\times 2.09J/gK\times (95-0)^oC]$

$\Delta H=574205.5J=574.2055kJ$ (1 KJ = 1000 J)

Therefore, the energy required is, 574.2055 KJ

3 0

3 years ago

As the distance between two objects increases the force of gravity between them is

stellarik [79]

The force of gravity is proportional to 1/r^2, where r is the radius (distance) between the objects.
So if the force was originally $\frac{1}{r^2}$ , doubling the distance between them would make the new force $\frac{1}{(2r)^2} = \frac{1}{4r^2} = (\frac{1}{4}) \frac{1}{r^2}$

6 0

3 years ago

A laser is used in eye surgery to weld a detached retina back into place. The wavelength of the laser beam is 503 nm, while the

V125BC [204]

Answer:

Number of proton emmitted by laser= $2.48*10^17proton$

Explanation:

Energy is the ability to cause change; power is directly proportional to energy and its the rate energy is utilized.

Power=energy/time.

First we need to calculate the total energy used which is equal to the total power utilized.

E(total)= P( total) = 1.4W × 0.070 s = $0.098J$

CHECK THE ATTACHMENT FOR THE REMAINING DETAILED CALCULATION

4 0

3 years ago

Chlorine gas reacts with fluorine gas to form chlorine trifluoride. Cl2(g)+3F2(g)→2ClF3(g) A 2.05 L reaction vessel, initially a

vitfil [10]

Answer:

2.4 grams of ClF3

Explanation:

First let us determine the moles of Cl2 and F2,

Cl2 = ( ( 337 )( 2.05 L ) / ( 0.082 )( 298 K ) ) * ( 1 atm / 780 ),

Cl2 = ( 690 / 24.436 ) * ( 1 / 780 ),

Cl2 = ( About ) 0.036 moles of Cl2

_________________________________________________

F2 = ( ( 729 )( 2 L ) / ( 0.082 )( 298 K ) ) * ( 1 atm / 780 ),

F2 = ( 1458 / 24.436 ) * ( 1 / 780 )

F2 = ( About ) 0.078 moles of F2

Now let us identify the limiting reactant, considering the ratio between ClF3 and Cl2 / F2. In this case F2 is the limiting reactant, as it forms a smaller molar ratio;

The theoretic yield is thus performed with the limiting reactant F2,

0.078 * ( 2 / 3 ) * ( 92.45 / 2 ) = ( About ) 2.4 grams of ClF3

4 0

3 years ago

Floppy Minaj dropped its trash <br>barbz is lame come for me sis?

MArishka [77]

Answer:

is this question or answer?

5 0

3 years ago

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