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3 years ago

10

How is the Delta Hf related to the delta H of a reaction?

2 answers:

NNADVOKAT [17]3 years ago

7 0

Answer:

The delta H reaction is the difference between Delta Hf products and Delta Hf reactants.

Explanation:

artcher [175]3 years ago

5 0

Answer:

n a chemical reaction, delta H represents the sum of the heats of formation, commonly measured in kilojoules per mol (kJ/mol), of the products minus the sum of those of the reactants. The letter H in this form is equal to a thermodynamic quantity called enthalpy, representing the total heat content of a system.

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10.0 grams of water are heated during the preparation of a cup of coffee 1.0x 103 j of the heat are added to the water. which is

nirvana33 [79]

<u>Answer:</u> The final temperature of the coffee is 43.9°C

<u>Explanation:</u>

To calculate the final temperature, we use the equation:

$q=mC(T_2-T_1)$

where,

q = heat released = $1.0\times 10^3J=1000J$

m = mass of water = 10.0 grams

C = specific heat capacity of water = 4.184 J/g°C

$T_2$ = final temperature = ?

$T_1$ = initial temperature = 20°C

Putting values in above equation, we get:

$1000J=10.0g\times 4.184J/g^oC\times (T_2-20)\\\\T_2=43.9^oC$

Hence, the final temperature of the coffee is 43.9°C

8 0

3 years ago

What is the average kinetic energy of 1 mole of gas at 102 degree celsius

Firlakuza [10]

<span>R= 8.314 J/mol K T= 273 + 102 = 375K</span><span>

= (3/2) x 8.314 x 375 = 4680 J/mol</span>

5 0

3 years ago

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Which pair of elements would form an ionic bond? <br> n and o k and be c and cl fe and ni

Grace [21]

Answer:

k and be

Explanation:

because ionic bond occurs between a metal and a non metal

I would appreciate if my answer is chosen as a brainliest answer

4 0

3 years ago

Use the de Broglie's Wave Equation to find the wavelength of an electron moving at 7.3 × 106 m/s. Please show your work. Note: h

ad-work [718]

Answer:

$\lambda=9.96\times 10^{-11}\ m$

Explanation:

The expression for the deBroglie wavelength is:

$\lambda=\frac {h}{m\times v}$

Where,

$\lambda$ is the deBroglie wavelength

h is Planck's constant having value $6.62607\times 10^{-34}\ Js$

m is the mass of electron having value $9.11\times 10^{-31}\ kg$

v is the speed of electron.

Given that v = $7.3\times 10^6\ m/s$

Applying in the equation as:

$\lambda=\frac {h}{m\times v}$

$\lambda=\frac{6.62607\times 10^{-34}}{9.11\times 10^{-31}\times 7.3\times 10^6}\ m$

$\lambda=\frac{10^{-34}\times \:6.626}{10^{-25}\times \:66.503}\ m$

$\lambda=\frac{6.626}{10^9\times \:66.503}\ m$

$\lambda=9.96\times 10^{-11}\ m$

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3 years ago

Hydrochloric acid reacts with calcium to form hydrogen and calcium chloride. If 100 grams of hydrochloric acid reacts with 100 g

LenaWriter [7]

Answer is hydrochloric acid

Hope this helps!

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3 years ago

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