Chemistry High School

Type the correct answer in the box. Express your answer to two significant figures.
A reaction between 1.7 moles of zinc Ipdide and excess sodium carbonate ylelds 12.6 grams of zinc carbonate. This is the equation for the
reaction:
Na2CO3 + Zniz - 2Nal +
ZnCoz.
What is the percent yield of zinc carbonate?
The percent yield of zinc carbonate is
5.91
1X.

Answers

Answer 1

Answer: The percent yield of zinc carbonate is 5.91 %

Explanation:

To calculate the moles :

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

[tex]\text{Moles of} ZnCO_3=\frac{12.6 g}{125.4g/mol}=0.100moles[/tex]

[tex]ZnI_2[/tex] is the limiting reagent as it limits the formation of product and [tex]Na_2CO_3[/tex] is the excess reagent.

[tex]Na_2CO_3+ZnI_2\rightarrow 2NaI+ZnCO_3[/tex]

According to stoichiometry :

1 mole of produce = 1 mole of

Thus 1.7 moles of [tex]ZnI_2[/tex] will produce=[tex]\frac{1}{1}\times 1.7=1.7moles[/tex] of [tex]ZnCO_3[/tex]

Theoretical yield of [tex]ZnCO_3=moles\times {\text {Molar mass}}=1.7moles\times 125.4g/mol=213.2g[/tex]

percentage yield = [tex]\frac{\text {Experimental yield}}{\text {Theoretical yield}}\times 100=\frac{12.6g}{213.2g}\times 100=5.91\%[/tex]

Answer 2

Answer:

the other person was right EXCEPT it says in 2 significant numbers so the answer is 5.9

Explanation:

i hope this helps. have a wonderful day :))

Related Questions

Krupton (Kr) is a

A. Gas
B. Metal
C. Non of these
D. Metalloid

Answers

B is gas

The chemical element krypton is classed as a noble gas and a nonmetal.

Love you

Answer: C. None of these

Explanation: Krypton is a noble gas, on the right side of the period table, making it a non-metal.

What is a reducing agent?

Answers

Answer: Its an element or compound that loses (or "donates") an electron to an electron recipient (oxidizing agent) in a redox chemical reaction.

CREDIT: Wikipedia

Answer:A reducing agent typically is in one of its lower possible oxidation states and is known as the electron donor.

Example: Examples of reducing agents include the earth metals, formic acid, oxalic acid, and sulfite compounds.

Question :What's oxidation?

Answers

Answer:

The process or result of oxidizing or being oxidized.(Rust)

Explanation:

Pluto

How many particles are in a 34 g sample of Al2(SO4)3?
please help!

Answers

Answer:

5.98 × 10^22 particles

Explanation:

To get the number of particles (nA) in a substance, we multiply the number of moles of the substance by Avogadro's number (6.02 × 10^23)

The mass of Al2(SO4)3 given in this question is as follows: 34grams.

To convert this mass value to moles, we use;

Mole = mass/molar mass

Molar Mass of Al2(SO4)3 = 27(2) + {(32 + 16(4) }3

= 54 + (32 + 64)3

= 54 + 288

= 342g/mol

mole (n) = 34/342

n = 0.0994mol

number of particles (nA) of Al2(SO4)3 = 0.0994 × 6.02 × 10^23

= 0.598 × 10^23

= 5.98 × 10^22 particles

When
Mercury
orbits
the
Sun,
it
gets
as
close
as
4.8
x
107
miles
to
the
Earth.

It
gets
as
far
as
1.38
x
108
miles
to
the
Earth.

What
is
the
difference
of
these
two distances

Answers

Answer:

hdkdjfjhdakdhevghggggfdffggggfggcdhxgjcfogogi

A 4.5L container of gas has a pressure of 3.0 atm at a temperature of 100 C. The container is expanded to 6L, and the temperature is increased to 200 C.

A) 2.85 atm

B) 5.3 atm

C) 1.05 atm

D) 100 K

Answers

I think it’s D or A

I have a bowling ball hanging from a chain in my room. What two forces are acting on the bowling
ball?

Answers

Answer:

Gravity and the chain is holding it up not sure what it is called. Also if you want free points go to my answers and look for a friday nigt funkin rp answer but anwer if you want to rp and if you know what it is

Explanation:

Answer:

Kinetic & Potential Energy

Explanation:

Kinetic Energy: Energy which a body possesses by virtue of being in motion.

Potential Energy: The energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors

Hope this helps! Have a good day/or night!

P.S: Sorry if I'm wrong I tried my best. Best wishes!!!

Number 8

in metals, reactivity increases ____ across a period, and in non metals reactivity increases ____ across a period.

A. to the left,to the left
B. to the left, to the right
C. to the right , to the left
D. to the right, to the right

Answers

It’s B. To the left,to the right

❤️

how many atoms in 1kg of platinum
a 2.5x10^24

b 3.1x10^24

Answers

Answer:

3.1x10^24 it will be in 1 kg of platinum

PLZZZZZZZZ HELP PLZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ PLZ PLZ PLZZZZZZZ these are satellite images taken of the same area in 1986 and in 2020 what can these images be used to monitor

Answers

C. How land use has changed over time.

Answer:

I believe it is how land use changed over time

Explanation:

The images only show us the labels of communities and farm land/ forests. There is no evidence to support that this map would be monitoring water quality, pollution, etc. The only visible change is the change in land.

How many Joules are required to heat 40g of water from 13°C to 40°C?
J

Answers

Answer: 1080

Explanation:

you have to subtract 40 from 13 frist then multiply the remins of the temeture with 40 and your answer is 1080

9. Circle the atom in each pair that has the greater ionization energy.

A) Li or Be
B) Ca or Ba
C) Na or K
D) P or Ar
E) Cl or Si
F) Li or K

Answers

A: BE has more ionization energy than LI

B: CA has more ionization energy than BA.
C: NA has more ionization energy than K

D: AR has more ionization energy than P

E: CI has a more ionization energy than SI
F: LI has more ionization energy than K

If any of these are wrong feel free to correct me in the comments.

A) Be

B) Ca

C) Na

D) Ar

E) Cl

F) Li

This question simply deals with ionization energy trends across the periodic table or down the group.

Ionization energy is the energy that is needed to remove an electron from its orbital around an atom in such a manner that it will no longer be associated with that same atom.

Now, from studies, it has been found that Ionization energy decreases down a group but it tends to increase as we go from the left to right going across the periodic table.

A) Li(Lithium) and Be(Berrylium) belong to the same period which is period 2 on the periodic table. Berrylium comes after berrylium in that period and as such from the rule earlier, berrylium will have the greater ionization energy.

B) Ca(Calcium) and Ba(Barium) belong to the same group 2 in the periodic table with barium further down the group. Thus, from the trend, Ca(Calcium) will have the greater ionization energy.

C) Na(Sodium) and K(Potassium) belong to the same group 1 in the periodic table with potassium further down the group. Thus, from the trend, Na(Sodium) will have the greater ionization energy.

D) P(Phosphorus) and Ar(Argon) belong to the same period which is period 3 on the periodic table. Argon comes after Phosphorus in that period and as such from the rule earlier, argon will have the greater ionization energy.

E) Cl(Chlorine) and Si(Silicon) belong to the same period which is period 3 on the periodic table. Cl(Chlorine) comes after Si(Silicon) in that period and as such from the rule earlier, Cl(Chlorine) will have the greater ionization energy.

F) Li(Lithium) and K(Potassium) belong to the same group 1 in the periodic table with potassium further down the group. Thus, from the trend, Li(Lithium) will have the greater ionization energy.

Read more at: brainly.in/question/13610645

I NEED HELP ASAP!! What is the difference between the experimental group and a control group?

Answers

I believe the control group is what doesn't change in the experiment, and the experimental group is what is being tested / receives the treatment :)

In at least 4 complete sentences, describe the similarities and differences between Avogadro's Law and Charles' Law.

Answers

answer

Avogadro's law states that, at constant temperature and pressure, the volume of a gas is directly proportional to the number of moles present. In other words, equal volumes of gases at the same pressure and temperature contain the same number of molecules - this is true regardless of their physical properties or chemical nature.

This number of molecules is

6.022

⋅

and is known as Avogadro's number,

Matematically, Avogadro's law can be written like this

, or, better yet,

Avogadro's law, as well as Boyle's law and Charles' law, are special cases of the ideal gas law,

. If temperature and pressure are kept constant, and knowing that

is of course constant, then

→

, which represents Avogadro's law.

The ideal gas law can also be written to incorporate

, since the number of moles are actually the number of molecules divided by Avogadro's number

⋅

, where

represents the number of molecules.

PLEASE HELPPP WILL GIVE BRAINLIEST!!!

Answers

Answer:

placental mammals

Explanation:

Answer:

B) placental mammals

Explanation:

If an
object is slowing down, the velocity will be
positive
zero
negative
constant

Answers

Answer:

I'm not 100% sure but I think it would be constant

Answer:

The object is moving in the negative direction!

Explanation:The object has a negative velocity) and is speeding up.

How much energy is used to heat 250 g of ice from –15°C to steam at 105°C? (Hint: 5 steps, all positive)

Answers

Answer:

Explanation: Q1 = mc(ice) ΔT (ice warms)

Q2 = ms (ice melts)

Q3 = mc((water) ΔT (water warms)

Q4 = mr (water boils)

Q5 = mc(vapour)ΔT

The fictional element “Nt” contains atoms with two valence electrons. Which type of intermolecular force is most likely responsible for the properties of NtF2?
O dipole-dipole forces
O ion-ion forces
O hydrogen bonding
O dispersion forces

Answers

ion-ion forces

Nt has two valence electrons, and bonds with F to form NtF2. This means that the ion form of Nt is Nt2+. This means that NtF2 is an ionic compound.

Describe the difference between a flask, beaker, and graduated cylinder.
How does the purpose of each differ?

Answers

Answer:

Both graduated cylinders and beakers are pieces of laboratory glassware that have a specific function. Graduated cylinders typically are more accurate at reading the volumes of the liquid inside. Beakers are better for stirring and mixing liquids.

Flasks are notable for their unique shape: a rounded vessel and a cylindrical neck. The main differing characteristic between a flask and a beaker is that beakers have straight sides, rather than slanted sides like a flask. Beakers are mainly for measuring and transporting liquids from one site to the next.

Explanation:

hope this helps!!!!

Select the correct answer.
John is riding a ski lift to the top of Wildcat Mountain. He removes his gloves and rapidly rubs his hands together to warm them up. What
happens when John rubs his hands?
O A. The skin on his hands rapidly conducts heat, similar to metal.
O B. He traps heat between his hands because skin is an insulator. IS
O C. The particles In his hands vibrate faster because of friction.
O D. Thermal energy moves from his fingertips to his palms.
O E. He simulates a fever that'll raise his core body temperature.

Answers

Answer:

Fairly certain it's C. The particles In his hands vibrate faster because of friction :)

Answer:

Explanation:

What is one thing that is the same about a mole of sodiums and a mole of carbons?
A) The weight
B) All of these
C) The total number of atoms
D) The mass

Answers

C the total number of atoms

What factor determines whether an acid or base is strong or weak?

A)The number of hydroxide ions.
B)The number of hydronium ions.
C)The extent to which the acid or base ionizes.

Answers

Answer:

i think it's c

Explanation:

Which of the answers does not represent a common type of air pollution? A) agricultural ammonia B) carbon monoxide exhaust C) sulfur oxide D) synthetic organic compounds E) industrial nitrogen oxide

Answers

Answer:

synthetic organic compounds

Explanation:

synthetic organic compounds are water pollutants

Write a net ionic equation for the reaction that occurs when aqueous solutions of nitric acid and sodium hydroxide are combined.
Be sure to specify states such as (aq) or (s).

Answers

Answer:

H^+(aq) + OH^-(aq) -------> H2O(l)

Explanation:

We must first write the molecular reaction equation as follows;

HNO3(aq) + NaOH(aq) ------>NaNO3(aq) + H2O(l)

The complete ionic equation is;

H^+(aq) + NO3^-(aq) + Na^+(aq) + OH^-(aq) -------> Na^+(aq) + NO3^-(aq) + H2O(l)

The net ionic equation therefore is;

H^+(aq) + OH^-(aq) -------> H2O(l)

how are a dog, a dolphin, and a bat similar to a human?

Answers

Answer:

The more structures that are similar, the more closely related organisms are in their evolutionary past. For example, a human, a dog, a fruit bat, and a dolphin all have the same pattern of bone structure in the upper extremity—one bone connected to two bones, connected to many bones, connected to finger-like bones.

Answer:

Explanation:

they are all made of cells

If you wanted to completely react 150 grams of FeBry, how many moles of sulfuric acid (H,SO) will you need to use?

Answers

Answer:

Sulfuric acid, spent appears as a black oily liquid. Corrosive to metals and tissue. Density 15 lb /gal.

Explanation:

What causes the difference in density of matter?

Answers

Answer:

because it has more space

Explanation:

density have many pressure

The more mass an object contains in a given space, the more dense it is. It is important to remember, though, that this relationship is not just about how closely packed together the atoms of an element or the molecules of a compound are. Density is also affected by the atomic mass of an element or compound.

If you want to change the type of element your atom is, you can either
(2 RIGHT CHOICES)
add a proton
add a neutron
add an electron

Answers

Answer:

Add a proton and add a neutron

1. How many grams are in 1.7 x 10^23 particles of Cl2?

2. How many moles are in 3.28 x 10^23 atoms of NaCl? *

3. If I were to determine how many liters 26 grams of water is, what type of conversion would this be? *

A Mass --> Moles --> Particles
B Mass --> Moles --> Volume
C Volume --> Mass --> Moles
D Moles --> Mass --> Volume

Answers

Answer: 1. 20.0 grams

2. 0.272 moles

3. B) Mass --> Moles --> Volume

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

To calculate the number of moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given molecules}}{\text{Avogadros number}}[/tex] or

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] or

Putting in the values we get:

1. [tex]\text{Number of moles of} Cl_2=\frac{1.7\times 10^{23}}{6.023\times 10^{23}}=0.282moles[/tex]

Mass of [tex]Cl_2=moles\times {\text {Molar mass}}=0.282mol\times 71g/mol=20.0g[/tex]

2. [tex]\text{Number of moles of NaCl}=\frac{3.28\times 10^{23}}{2\times 6.023\times 10^{23}}=0.272moles[/tex]

3. [tex]\text{Number of moles of water}=\frac{26g}{18g/mol}=1.44moles[/tex]

Volume of water =[tex]moles\times {\text {Molar volume}}=1.44mol\times 22.4L/mol=32.4L[/tex]

Those microscopic organisms perform what 2 processes that help pave the way for lichen by creating organic material.

Answers

Answer:

Decomposition pf residues and weathering of rock.

Explanation:

Microorganisms performs two processes such as decomposition and weathering of rock materials. These two processes make the medium suitable for the growth and development of the lichens because these processes increases nutrient and organic matter on the rock surface that is used by the lichens for its growth. In decomposition process, larger compounds are broken down into simpler substances while on the other hand, the weather of rocks causes breakdown of rock material into simpler minerals that also used by the lichens.

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