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2 years ago

1. Have scientists been able to invent a perpetual motion machine? O Yes O No

2 answers:

5 0

The answer is No
I think this way because of the law of first law of thermodynamics where it says that energy can't be created or destroyed. This means you can’t receive more energy then you put in. In conclusion a machine could only ever produce as much energy as it consumed.

FromTheMoon [43]2 years ago

3 0

After using my big brain it’s No

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A solution is prepared by mixing 2.17 g of an unknown non-electrolyte with 225.0 g of chloroform. The freezing point of the resu

Deffense [45]

Answer:

The molar mass of the unknown non-electrolyte is 64.3 g/mol

Explanation:

Step 1: Data given

Mass of an unknown non-electrolyte = 2.17 grams

Mass of chloroform = 225.0 grams

The freezing point of the resulting solution is –64.2 °C

The freezing point of pure chloroform is – 63.5°C

kf = 4.68°C/m

Step 2: Calculate molality

ΔT = i*kf*m

⇒ ΔT = The freezing point depression = T (pure solvent) − T(solution) = -63.5°C + 64.2 °C = 0.7 °C

⇒i = the van't Hoff factor = non-electrolyte = 1

⇒ kf = the freezing point depression constant = 4.68 °C/m

⇒ m = molality = moles unknown non-electrolyte / mass chloroform

0.7 °C = 1 * 4.68 °C/m * m

m = 0.150 molal

Step 3: Calculate moles unknown non-electrolyte

molality = moles unknown non-electrolyte / mass chloroform

Moles unknown non-electrolyte = 0.150 molal * 0.225 kg

Moles unknown non-electrolyte = 0.03375 moles

Step 4: Calculate molecular mass unknown non-electrolyte

Molar mass = mass / moles

Molar mass = 2.17 grams / 0.03375 moles

Molar mass = 64.3 g/mol

The molar mass of the unknown non-electrolyte is 64.3 g/mol

6 0

2 years ago

If the hydrogen ion concentration is 10-7M, what is the pH of the solution?<br><br> Show all work.

Kobotan [32]

Remember pH=-log(H ions). So it would be pH=-log(10^-7).

6 0

3 years ago

HELPPPPPPPPPP MEEEEEEE

Monica [59]

50% - you have two bb pairs

5 0

2 years ago

Read 2 more answers

What are 6 abiotic factos from finding nemo?

julsineya [31]

Abiotic are nonliving things. So just name 6 nonliving things in finding nemo

8 0

3 years ago

"A sphere of radius 0.50 m, temperature 27oC, and emissivity 0.85 is located in an environment of temperature 77oC. What is the

Aleksandr-060686 [28]

Explanation:

It is known that formula for area of a sphere is as follows.

A = $4 \pi r^{2}$

= $4 \times 3.14 \times (0.50 m)^{2}$

= 3.14 $m^{2}$

$T_{a}$ = (27 + 273.15) K = 300.15 K

T = (77 + 273.15) K = 350.15 K

Formula to calculate the net charge is as follows.

Q = $esA(T^{4} - T^{4}_{a})$

where, e = emissivity = 0.85

s = stefan-boltzmann constant = $5.6703 \times 10^{-8} Wm^{-2} K^{-4}$

A = surface area

Hence, putting the given values into the above formula as follows.

Q = $esA(T^{4} - T^{4}_{a})$

= $0.85 \times 5.6703 \times 10^{-8} Wm^{-2} K^{-4} \times 3.14 \times ((350.15)^{4} - (300.15)^{4})$

= 1046.63 W

Therefore, we can conclude that the net flow of energy transferred to the environment in 1 second is 1046.63 W.

8 0

2 years ago