Chemistry Stoichiometry Question

Answer: 1. 2 moles of oxygen atoms = 32 grams

2. 2 moles of oxygen molecules = 64 grams

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number of particles.

1 mole of oxygen atom (O) weighs = 16 g

Thus 2 moles of oxygen atom (O) weighs = [tex]\frac{16}{1}\times 2=32 g[/tex]

Also 1 mole of oxygen molecule [tex](O_2)[/tex] weigh = 32 g

Thus 2 moles of oxygen molecule [tex](O_2)[/tex] = [tex]\frac{32}{1}\times 2=64 g[/tex]

Answer:

0.13 grams of O2

Explanation:

Just did worksheet

Answer:

[tex]a=200\ m/s^2[/tex]

Explanation:

Given that,

The mass of a ball, m = 0.025kg

The force exerted by the magnet, F = 5 N

We need to find the acceleration of the ball when it begins to move. Let a be the acceleration. The net force of the ball is given by :

F = ma

Where

a is acceleration of the ball

[tex]a=\dfrac{F}{m}\\\\a=\dfrac{5}{0.025}\\\\a=200\ m/s^2[/tex]

so, the required acceleration of the ball is [tex]200\ m/s^2[/tex].

Answer: 1.80 moles of [tex]H_2[/tex] will be produced 1.20 moles of aluminium.

Explanation:

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]    

The balanced chemical reaction is:

[tex]6HCl(aq)+2Al(s)\rightarrow 3H_2(g)+2AlCl_3(aq)[/tex]  

According to stoichiometry :

2 moles of [tex]Al[/tex] produce = 3 moles of [tex]H_2[/tex]

Thus 1.20 moles of [tex]Al[/tex] will produce=[tex]\frac{3}{2}\times 1.20=1.80moles[/tex]  of [tex]H_2[/tex]

Thus 1.80 moles of [tex]H_2[/tex] will be produced 1.20 moles of aluminium.

Answer:

Selenium

Explanation:

One way to figure this out is to count the electrons and add them up.

2+2+6+2+6+2+10+4 = 34 electrons

A neutral atom has the same number of electrons and protons. Protons tell us the atomic number of an element. Element number 34 is Selenium.

Another way to figure it out is to look at just the highest "s" or "p" level of the electron configuration, and then see which element corresponds to that. This element has a 4s and a 4p, so I will look at 4p. The configuration is 4p4, so I will look at the 4th row of the periodic table (4p4) in the "p" block (4p4) and the 4th element in the "p" block (4p4). That's selenium :)

Answer:

the attraction water molecules have to other surfaces

Explanation:

Adhesion is defined as  the attractive forces between unlike substances, e.g water moving up a capillary tube.

Adhesion is the tendency of dissimilar particles or surfaces to cling to one another(Wikipedia).

So, what we mean by adhesion in this context, is the attraction water molecules to other surfaces.

Answer:

An electric current is created

An electric current is created when a wire moves between the poles of a magnet.

So, option A is correct.

learn about electric current,

https://brainly.com/question/2264542

#SPJ2

Answer:

C. The Zebra Mussels had not yet been introduced to the area.

2.

Unionid Mussels they had a headstart in 1990

When the Zebra arrived they ate all the food in the area leaving Unionid numbers to decline and die as they have no food to eat.

Nitric acid, is a highly corrosive mineral acid. The pure compound is colorless, but older samples tend to acquire a yellow cast due to decomposition into oxides of nitrogen and water.

There are THREE different elements and a total of FIVE atoms in nitric acid.

The formula for nitric acid is HNO3. This means there is one atom of hydrogen, one atom of nitrogen, and three atoms of oxygen in one molecule of nitric acid.

So, Thus, your answer will be FIVE if you're counting the molecules but if you are counting the elements then it is THREE.

-Snooky

Answer:

strong winds that blow in short spurts over a small distance

Explanation:

Generally, the most common factor that causes the largest waves in the ocean is winds. this is also called wind-driven waves of the ocean when the surface wind flows on the surface of the ocean, this disturbance creates the friction between surface wind and surface of the ocean which creates waves in the ocean

Answer:

B

Explanation:

k-12 test

Answer:

Answer is C since activation energy is needed in a reaction

Potential energy is the energy present in the reactions. The potential energy of the reactant in the graph is more than that of the product. Thus, option A is accurate.

Potential energy is the energy of the reaction that results in the formation of products. The potential energy is reduced in the exothermic reactions as energy is released along with the products.

The bonds present in the reactants in the reaction mixture split in the presence of the activation energy to release energy and form the product.

Therefore, option A. the graph shows the greater potential energy of the reactant.

Learn more about potential energy here:

https://brainly.com/question/2292813

#SPJ2

Answer:

There are

1.479

×

10

−

13

concentration of hydrogen ions

m

o

l

L

.

Explanation:

Because pH is a logarthmic scale, we can use the formula:

[

H

+

]

=

10

-pH

. Where...

=>

[

H

+

]

is the concentration of hydrogen ions in the solution.

=>

p

H

is the pH of the solution.

=> Where

10

is the base of the power - it's a logarithm formula.

We can now just sub in the values and solve for [

H

+

]

.

[

H

+

]

=

10

-pH

=

10

−

(

12.83

)

=

1.479108388

×

10

−

13

We can round (if required) to

1.479

×

10

−

13

.

Thus, there are

1.479

×

10

−

13

concentration of hydrogen ions

m

o

l

L

.

Hope this helps :)

Answer:

Mass=23

Explanation:

Mass= Protons + neutrons

Atomic number is the number of protons in magnesium.

Atomic number =12...So there are 12 protons

12p + 11n = 23

Answer:

the same

Explanation:

due to the law of conservation of mass, the mass will not change

Answer: The mass will be the same it will not be able to change.

Explanation: due to the law of conservation of mass, the mass will not change telling us that the mass and the grams or whatever it was saying on there will stay exactly no change. so the 250 grams will not change.

Answer:

sorry sorry sorry sorry

Answer: D

Explanation:

because mold is a chemical reaction with with the air that's why the put a date cause the bread can only last for so long in till the chemical reaction.But D is is right because your body has to go though a chemical reaction in or to digest it and and break it down even more.So D would be the right answer cause that's where most of your chemical reaction happens when food is swallowed into the stoamch i hope i was able to explain it as much as i can

Answer:

8 moles of oxygen.

Explanation:

The chemical formula for barium hydroxide is Ba(OH)₂

This means one mole of barium hydroxide contains one mole of barium, two moles of hydrogen, and two moles of oxygen. If you have four moles of Ba(OH)₂ you will have four times the amount that is found in one mole.

4 moles of Ba(OH)₂ will have 8 moles of oxygen.

The number of moles of oxygen atoms we have in the compound is 8 moles .

The chemical equation for barium hydroxide is as follows:

Ba(OH)₂

According to the compound we have 1 atom of barium, 2 atoms of oxygen and 2 atoms of hydrogen.

Therefore, 4 moles of the compound can be represented as follows;

4 Ba(OH)₂

This means we have 4 atoms of barium, 8 atoms of oxygen and 8 atoms of hydrogen.

Therefore, we have  8 moles of oxygen atoms or 4 moles of oxygen molecules.

learn more: https://brainly.com/question/12228235?referrer=searchResults

Answer:

CO2 should be 50.88 g

Explanation:

CH4 + 2 O2  -->  CO2 + 2 H2O

First, find the moles of CH4:

Molar Mass of CH4 (formular mass):

12+1*4=16 g/mol (actually just use the atomic mass in your periodic table to add them up)

Then we can find how many moles in CH4 = 18.5÷16=1.15625 mol

As we know 1 mole of methane(CH4) makes 1 mole of CO2, so if 1.15625 moles of methane is reacted, 1.15625 moles of CO2 will be made.

So the moles of CO2 is 1.15625 moles.

Calculate the mass of CO2:

Molecular mass: 12+16*2=44 g/mol

Mass=44*1.15625=50.88 g (cor. to 2 d.p.)

Answer:

it would be C average kinetic energy

Answer:

8.85 because im smart

Answer:

9.36 grams NaOH needed

Explanation:

Given Rxn

(NH₄)₂SO₄(aq) + 2NaOH(aq) → Na₂SO₄(aq) + 2NH₃(g) + 2H₂O shows a molar reaction ratio of 1-mole (NH₄)₂SO₄ to 2-moles NaOH. If the 15.4 gram sample of (NH₄)₂SO₄ is converted to moles, then 2 times moles of ammonium sulfate will be the molar amount of NaOH needed to completely react. Complete computation by converting moles to grams NaOH; that is, multiply by formula wt. of NaOH (=40g/mol).

moles (NH₄)₂SO₄ = 15.4g/132.14g·mol⁻¹ = 0.117 mole (NH₄)₂SO₄.

moles NaOH = 2 x 0.117-mole = 0.234-mole NaOH needed.

∴grams NaOH needed = 0.234-mole NaOH x 40-g NaOH/mole NaOH = 9.36 grams NaOH needed. (3 sig. figs.)

Then multiply   0.117 mole by 2 => 0.234 mole NaOH needed to completely react with the 0.117 mole (NH₄)₂SO₄. Converting to mole to grams, multiply by formula wt. of NaOH => 0.117 mole x 40g/mole = 9.36 grams NaOH needed.

Explanation:

Elements contained. C. H

% by mass. 10.6. 4.4

/ each by its a.m. 10.6/12.0. 4.4/1.0

amount. 0.88. 4.4

/ each by the smaller. 0.88/0.88. 4.4/0.88

ratio of amount. 1.00. 5.00

simplest whole number ratio= 1 : 5

The empirical formula=CH5

Answer:

Inside the DNA molecules

Answer:

Genes give instructions to proteins; protein structure determines traits.

Explanation:

Answer:

the answer is electron....