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Levart
19 hours ago
6

27. How much energy is required to change 150.0 g of water from 10.0°C to 45.0°C? (Cwater =

Chemistry
1 answer:
Alekssandra [2.8K]19 hours ago
5 0

Answer:

The correct option is C. 21900.3. I calculated 21945 J, which makes option C closely aligned with my result.

Explanation:

Data

mass = 150 g

initial temperature T1 = 10°C

final temperature T2 = 45°C

Cw = 4.18 J/g°C

Formula

Q = mCΔT = mC(T2 - T1)

Substitution

Q = (150)(4.18)(45 - 10)

Simplification

Q = (150)(4.18)(35)

Result

Q = 21945 J

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En un balneario necesitan calentarse 1 millón de litros de agua anuales, subiendo la temperatura desde 15 ºC a 50 ºC y para ello
KiRa [2857]

Answer:

a) m_{CH_4}=2630kg

b) 1657 €

Explanation:

Hola,

a) En esta cuestión analizaremos el millón de litros de agua anualmente, dado que este dato nos permite calcular el calor necesario para calentar dicha cantidad, considerando que la densidad del agua es de 1 kg/L:

Q_{H_2O}=m_{H_2O}Cp(T_2-T_1)=1x10^6LH_2O*\frac{1kgH_2O}{1LH_2O}*4.18\frac{kJ}{kg\°C}(50-15) \°C\\Q_{H_2O}=146.3x10^6kJ

A continuación, utilizamos la entalpía de combustión del metano para determinar la cantidad en kilogramos necesaria, ya que la energía calórica perdida por el metano es equivalente a la energía obtenida por el agua:

Q_{H_2O}=-Q_{CH_4}=-146.3x10^5kJ=m_{CH_4}\Delta _cH_{CH_4}

m_{CH_4}= \frac{Q_{CH_4}}{\Delta _cH_{CH_4}} =\frac{-146.3x10^5kJ}{-890kJ/molCH_4} *\frac{16gCH_4}{1molCH_4} \\\\m_{CH_4}=2630112.36g=2630kg

b) En este supuesto, tenemos que, bajo condiciones normales de 1 bar y 273 K, el precio de 1 metro cúbico de metano es 0,45 €, lo que nos permite calcular las moles de metano en esas condiciones:

n_{CH_4}=\frac{PV}{RT}=\frac{1atm*1000L}{0.082\frac{atm*L}{mol*K}*273K} =44.67mol

En consecuencia, los kilogramos de metano que se obtienen por 0,45 € son:

44.67molCH_4*\frac{16gCH_4}{1molCH_4}*\frac{1kg}{1000g} =0.715kgCH_4

Finalmente, usando regla de tres:

0.715 kg ⇒ 0.45 €

2630 kg ⇒ X

X = (2630 kg x 0.45 €) / 0.715 kg

X = 1657 €

Regards.

3 0
1 month ago
The recommended daily allowance (rda of calcium is 1.2 g. calcium carbonate contains 12.0% calcium by mass. how many grams of ca
eduard [2645]
1) Calcium carbonate comprises 40.0% calcium by weight.
M(CaCO₃)=100.1 g/mol
M(Ca)=40.1 g/mol
w(Ca)=40.1/100.1=0.400 (which is 40.0%)!

2) The mass fraction mentioned is superfluous information.

3) The resulting solution is:

m(Ca)=1.2 g

m(CaCO₃)=M(CaCO₃)*m(Ca)/M(Ca)

m(CaCO₃)=100.1g/mol*1.2g/40.1g/mol=3.0 g
4 0
1 month ago
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Magnesium ions for ionic bonds with fluoride ions in a 1:2 ratio. Explain how electrons are transferred between atoms and how th
eduard [2645]

I hope this is useful......

4 0
28 days ago
A balloon filled with 1.22 L of gas at 286 K is heated until the
VMariaS [2860]

Response: 670K

Rationale:

Provided data includes:

Initial volume of gas V1 = 1.22 L

Initial temperature T1 = 286 K

Final volume V2 = 2.86 L

Final temperature T2 =?

As temperature and volume are interrelated when pressure remains constant, apply Charles' law:

V1/T1 = V2/T2

1.22 L/286 K = 2.86 L/ T2

Cross multiplication yields:

1.22 L x T2 = 286 K x 2.86 L

1.22T2 = 817.96

Solving for T2:

1.22T2/1.22 = 817.96/1.22

T2 = 670.459 K (rounded to the nearest whole number is 670 K)

Therefore, the gas temperature is 670 Kelvin

4 0
27 days ago
!!15 points!!Which of the following phrases describes how the position of an electron
Alekssandra [2891]
A. The energy of an electron increases as its distance from the nucleus increases.
8 0
17 days ago
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