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3 years ago

10

The temperature of a sample of water in the liquid phase is raised 30 degrees Celsius by the addition of 3762 J. What is the mas

s of the water in grams?
A. 0.03
B. 0.30
C. 30
D. 300

1 answer:

Butoxors [25]3 years ago

3 0

The answer is A because it’s how you calculate the mass

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10. the answer is not D , I know for a fact

Cerrena [4.2K]

A I have a periodic table with me I checked

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3 years ago

At a given temperature, the equilibrium constant for the formation of HI from H2 and I2 was found to be 29.9. Calculate the equi

evablogger [386]

Answer:

The correct answer is: K'= 0.033.

Explanation:

The formation of HI from H₂ and I₂ is given by:

H₂ + I₂ → 2 HI K= 29.9

The decomposition of HI is the reverse reaction of the formation of HI:

2 HI → H₂ + I₂ K'

Thus, K' is the equilibrium constant for the reverse reaction of formation of HI. It is calculated as the reciprocal of the equilibrium constant of the forward reaction (K):

K' = 1/K = 1/(29.9)= 0.033

Therefore, the equilibrium constant for the decomposition of HI is K'= 0.033

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4 years ago

Match the layers of the atmosphere

Ira Lisetskai [31]

Answer:

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3 years ago

Charcoal from the dwelling level of the Lascaux Cave in France gives an average count of 0.97 disintegrations of ^14 C per minut

Verdich [7]

Answer:

Explanation:

count given by old sample = .97 disintegrations per minute per gram

count given by fresh sample = 6.68 disintegrations per minute per gram

Half life of radioactive carbon = 5568 years

rate of disintegration

dN / dt = λ N

In other words rate of disintegration is proportional to no of radioactive atoms present . As number reduces rate also reduces .

Let initial no of radioactive be N₀ and after time t , number reduces to N

N₀ / N = 6.68 / .97

Now

$N=N_0e^{-\lambda t}$

$\frac{N}{N_0} =e^{-\lambda t}$

$\frac{6.68}{.97} = e^{\lambda t}$

λ is disintegration constant

λ = .693 / half life

= .693 / 5568

= .00012446 year⁻¹

Putting the values in the equation above

$\frac{6.68}{.97} = e^{.00012446\times t}$

$6.8866 = e^{.00012446\times t}$

1.929577 = .00012446 t

t = 15503.6 years .

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3 years ago

What makes an isotope of an element

ser-zykov [4K]

Answer:

Isotopes of an element share the same number of protons but have different numbers of neutrons. ... This means that all three isotopes have different atomic masses (carbon-14 being the heaviest), but share the same atomic number (Z=6).

Explanation:

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3 years ago