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2 years ago

Assignment Summary

Chemistry

1 answer:

Alexeev081 [22]2 years ago

7 0

Answer:

Thermochemical Equations Project: Modeling Energy Changes

Assignment Summary In this assignment, you will write and balance a chemical equation. Then,you will use a table of enthalpy values to calculate the energy change in the reaction. Next, you will create a model of the energy change in the reaction.Finally, you will write an explanation that describes the energy change in the reaction.

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What is the molar mass of HBR

alexdok [17]

Answer:

Molar mass of bromine is equal to $80.9119$

Explanation:

The molar mass of HBr is equal to the sum of atomic weight of Bromine.

Atomic Weight of hydrogen is equal to $1.00794$

Atomic Weight of Bromine is equal to $79.904$

Molar mass of Bromine

= Atomic Weight of hydrogen + Atomic Weight of Bromine

Molar mass of Bromine $= 79.904 + 1.00794 = 80.9119$

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3 years ago

A cough syrup contains 5.0% ethyl alcohol, c2h5oh, by mass. if the density of the solution is 0.9928 g/ml, determine the molarit

WARRIOR [948]

To answer the question above, let us a basis of the 1000 mL or 1 L.
volume = (0.9928 g/mL)(1000mL) = 992.8 g
Then, determine the mass of the alcohol by multiplying the total mass by the decimal equivalent of 5%.
mass of alcohol = 0.05(992.8 g) = 49.64 g
Then, determine the number of moles of ethyl alcohol by dividing the mass of alcohol by the molar mass (46 g/mol).
n = 49.64 g/ (46 g/mol) = 1.08 mol
Then, divide the number of moles by the volume (our basis is 1 L)
molarity = 1.08 mol/ 1 L = 1.08 M

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3 years ago

How do the test variables (independent variables) and outcome variables (dependent variables) in an experiment compare? A. The o

SVETLANKA909090 [29]

Answer:

Explanation:

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3 years ago

Read 2 more answers

Which buffer would be better able to hold a steady pH on the addition of strong acid, buffer 1 or buffer 2? Explain. Buffer 1: a

Talja [164]

Answer:

Buffer 1.

Explanation:

Ammonia is a weak base. It acts like a Bronsted-Lowry Base when it reacts with hydrogen ions.

$\rm NH_3\; (aq) + H^{+}\; (aq) \to {NH_4}^{+}\; (aq)$ .

$\rm NH_3$ gains one hydrogen ion to produce the ammonium ion $\rm {NH_4}^{+}$ . In other words, $\rm {NH_4}^{+}$ is the conjugate acid of the weak base $\rm NH_3$ .

Both buffer 1 and 2 include

the weak base ammonia $\rm NH_3$ , and
the conjugate acid of the weak base $\rm {NH_4}^{+}$ .

The ammonia $\rm NH_3$ in the solution will react with hydrogen ions as they are added to the solution:

$\rm NH_3\; (aq) + H^{+}\; (aq) \to {NH_4}^{+}\; (aq)$ .

There are more $\rm NH_3$ in the buffer 1 than in buffer 2. It will take more strong acid to react with the majority of $\rm NH_3$ in the solution. Conversely, the pH of buffer 1 will be more steady than that in buffer 2 when the same amount of acid has been added.

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4 years ago

Which element has the lowest first ionization energy? (F), (Li), (Fr), (Rb)?

Mariulka [41]

Answer:

Explanation:

Francium (Fr) has the lowest ionization energy, with a value of 4.0727eV. This ionization energy increases as one advances in a period, being greater in the group of nonmetals.

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3 years ago