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ivann1987 [24]
2 years ago
12

II. Resuelve los siguientes ejercicios (consulta La tabla entalpias estándar de formación, que se encuentra en el apartado de do

cumentos digitales)
1. Calcula la entalpia de reacción del siguiente proceso y menciona si es una reacción endotérmica o exotérmica.
2NO(g) + O 2(g) → 2NO 2 (g)
Chemistry
1 answer:
Afina-wow [57]2 years ago
4 0

For all the people that don't speak this language This is what it says.

Solve the following exercises (see The standard formation enthalpies table, found in the digital documents section)

1. Calculate the enthalpy of the reaction for the following process and state whether it is an endothermic or exothermic reaction

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How many atoms are represented in 28 grand of sodium
Nady [450]
The molar mass of sodium is 22.99 ㅤ ㅤ ㅤ 22.99 (28) = 643.72 mol now multiply by avogrados number to find the number of atoms. ㅤ ㅤ ㅤ 643.72 (6.022 x 10^23) = 3.88 x 10^26 number of atoms
8 0
3 years ago
Help. The answer to question 1 I didn't mean to click so please answer that as well.
Zepler [3.9K]
We have that energy=specific heat * change in temperature * mass. Thus, we have the final temperature (22) minus the initial temperature (55) to equal -33 as our change in temperature. Our specific heat is in J/g*C, so we're good with that because g stands for grams and the aluminium is measured in grams. As there are 10 grams of aluminum, we have
10*(-33)*0.902=-298 ish as our final temperature

An exothermic reaction would release energy and would therefore lose heat itself, while an endothermic reaction would absorb energy and gain heat. Therefore, losing heat would be an exothermic reaction

Feel free to ask further questions!
4 0
2 years ago
Calculate the mass fraction of sodium chloride in the solution if 20 g of it is dissolved in 300 ml of water.
MA_775_DIABLO [31]

The mass fraction of sodium chloride is 0.0625

<h3>What is the mass fraction of sodium chloride in the solution?</h3>

The mass fraction of sodium chloride is the ratio of the mass of sodium chloride to the total mass of the solution.

The mass fraction of sodium chloride is determined as follows;

mass of sodium chloride = 20 g

  • mass of water = volume * density

density of water = 1 g/mL

volume of water = 300 mL

mass of water = 300 mL * 1 g/mL

mass of water = 300 g

total mass of solution = 20 + 300 = 320 g

mass fraction of sodium chloride = 20/320

mass fraction of sodium chloride = 0.0625

Learn more about mass fraction at: brainly.com/question/14783710

#SPJ1

5 0
1 year ago
What does an arrow in a chemical equation show?
kobusy [5.1K]

Answer:

A chemical equation consists of the chemical formulas of the reactants (on the left) and the products (on the right). The two are separated by an arrow symbol (“→” usually read aloud as “yields”). ... The equation also identifies that all the compounds are in the gaseous state.

Explanation:

6 0
3 years ago
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How might proper lab techniques impact a scientist work?
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Because if the the technique is wrong the scientist is wrong I’m sorry it’s a bad answer :(
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3 years ago
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