Chemistry, 15.07.2019 13:30, alexusray

Solve this stoichiometry problem 2 2 unread replies. 2 2 replies. solve the following problem showing all of your work and including all units. you can solve the problem in several steps or as a tandem conversion problem. how many grams of br2 are needed to completely convert 15.0 g al to albr3 ? al (s) + br2 (l) --> albr3 (hint: the equation is not balanced)

Answers: 1

Show answers

Answers

answered: ecletcicbeauty5793

Answer : For, this question,

The balanced equation is; 2Al + 3 $Br_{2}$ ----> 2Al $Br_{3}$

We can now, calculate how many grams of will be needed to completely convert 15 g of Al into Al $Br_{3}$ .

Here, the reaction produces, 2 moles of Al $Br_{3}[/tex} by consuming 2 moles of Al and 3 moles of [tex]Br_{2}$

So, For 15.0 g of Al; we can calculate;

(15.0 g Al) X (1 mole Al / 26.98 g Al) X (3 moles / 2 moles Al) X (159.81 g / 1 mole )

= 133 g of $Br_{2}$ will be needed.

Therefore, 133g of will be needed to completely convert 15 g of Al into Al $Br_{3}$ .

answered: tristanf123

Answer : The mass of Br_2 needed are, 131.8 grams

Solution : Given,

Mass of Al = 15 g

Molar mass of Al = 27 g/mole

Molar mass of Br_2 = 159.8 g/mole

First we have to calculate the moles of Al.

$\text{Moles of Al}=\frac{\text{Mass of Al}}{\text{Molar mass of Al}}=\frac{15g}{27g/mole}=0.55mole$

Now we have to calculate the moles of Br_2

The given balanced reaction will be,

$2Al+3Br_2\rightarrow 2AlBr_3$

From the balanced reaction, we conclude that

As, 2 moles of Al react with 3 moles of Br_2

So, 0.55 mole of Al react with $\frac{3}{2}\times 0.55=0.825mole$ of Br_2

Now we have to calculate the mass of Br_2

$\text{Mass of }Br_2=\text{Moles of }Br_2\times \text{Molar mass of }Br_2$

$\text{Mass of }Br_2=0.825mole\times 159.8=131.8g$

Therefore, the mass of Br_2 needed are, 131.8 grams

answered: Guest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

answered: Guest

The answer should be vaporization

Other questions on the subject: Chemistry

Chemistry, 22.06.2019 07:30, superfly903

Plz mark brainliest 30 points 1) find the momentum of a 12 kg snowball that is rolling with a velocity of 9 m/s. 2) an 8 ball with a mass of .5 kg is sitting at rest. it is hit by the cue ball (1 kg) traveling at 2.5 m/s. if the cue ball is at rest after the collision, how fast is the 8 ball traveling after the collision? 3) two football players are running toward each other. if the offensive player is 75 kg and is running 8 m/s, how fast must the 60 kg defensive player run in order for the two players to hit and stop?

Answers: 1

continue

Chemistry, 22.06.2019 13:30, kkingstone7062

What does the xylem do? stores the glucose captures the sunlight absorbs oxygen into the leaf carries water from the roots to the leaves

Answers: 1

continue

Chemistry, 22.06.2019 14:30, Crxymia

Amixture that has two or more substances that are spread out evenly is called a. compound b. heterogeneous c. substance d. homogeneous

Answers: 1

continue

Chemistry, 22.06.2019 20:50, LoneWolves

At element makes up all organic compounds?