Compute the mass of KI needed to prepare 500 mL of a 0.750 M solution.

Answers

Answer 1

Answer:

62 grams

Explanation:

Molarity=mol/liter

We have mL and Molarity

500 mL * 1 L/1000 mL=0.5

Plug 0.5 in and solve for moles

0.75=mol/0.5

0.75*0.5=0.375 mol

Convert to grams by finding the mass of KI: 39+126.9= 165.9 grams

0.375 mol KI * 165.9 grams KI/1 mol KI= 62.2125 grams

Answer 2

The mass of KI needed is 124.5 grams, this can be calculated by adding the values in molarity formula.

What is Molarity?

It is defined as number of moles of solute over volume of solution in liters.

It is given by:

M = n/ V

What information do we have?

Molarity= 0.750 M

Volume = 500 mL= 1 L

Molar mass of KI = 166 g/mol

To find:

Mass of KI=?

On substituting the values:

M= n/V

0.750 M= n/ 1 L

n= 0.750 M* 1l

n= 0.750 moles

Number of moles is the ratio between mass and molar mass.

n= m/M

0.750 moles = m/ 166 g/mol

m= 0.750*166

m= 124.5 grams.

Thus, the mass of KI needed is 124.5 grams.

Find more information about Molarity here:

brainly.com/question/17138838


Related Questions

oi oi oi oi ewin
.................

Answers

Muy bein me gusta hope this makes you smile

What is the volume of 45 g of Hydrogen gas (H2) at STP?

Answers

Volume>500•L
hope this helps!!!

How many grams of H2SO4 will react 650.0 grams of NaOH?

Answers

Answer:

H2SO4 + 2NAOH➡NA2SO4+2H2O

H2SO4 = 1*2 +32+16*3= 98g

NAOH = (11+16+1)=28

Explanation:

To calculate the number of Mole = Mole *Molar Mass

To calculate for gram = Mole/ Molar Mass

20.5g NaoH/1 * 1 mole NaOH/28g NaoH = 0.73M NaoH

0.73M NaoH /1 * 1 M H2SO4 /2M NaoH = 0.37M H2SO4

0.37 M H2SO4 /1 * 98g H2SO4 /1M H2SO4 = 0.00367g H2SO4

:- 0.00367g of Sulphuric Acid will be needed to complete the reaction.

Which of the following is an ionization reaction?
a. H2SO4 (aq) + Ca(OH)2 (aq) → CaSO4 (s) + 2 H2O (l)
b. NH3 (aq) + H2O (l) ⇋ NH4+ (aq) + OH– (aq)
c. CH3COO– (aq) + H2O (l) ⇋ CH3COOH (aq) + OH– (aq)
d. None of these
e. H2O (l) + H2O (l) ⇋ H3O+ (aq) + OH– (aq

Answers

Answer:

d

Explanation:

CHEMISTRY HELP ASAP
Use this balanced equation for the two questions below:
2KClO3(s) → 2KCl(s) + 3O2(g)
9. How many moles of KClO3 are used to produce 9.9 moles of O2?

10. How many moles of O2 are produced from 11.2 moles of KClO3?

PLS SHOW WORK TOO THX

Answers

Answer:

1 mole of KClO_3 contains 3 moles of O.

10 moles of O_2 contains 20 moles of O.

You need 20/3 moles of KClO_3 to produce 10 moles of O_2

Explanation:

sana makatulong

What volume will 1.27 moles of helium gas occupy at 80.00 °C and 1.00 atm?
Pls and thank you :) !

Answers

Answer:

36.8 L

Explanation:

We'll begin by converting 80 °C to Kelvin temperature. This can be obtained as follow:

T(K) = T(°C) + 273

T(°C) = 80 °C

T(K) = 80 + 273

T(K) = 353 K

Finally, we shall determine the volume occupied by the helium gas. This can be obtained as follow:

Number of mole (n) = 1.27 moles

Temperature (T) = 353 K

Pressure (P) = 1 atm

Gas constant (R) = 0.0821 atm.L/Kmol

Volume (V) =?

PV = nRT

1 × V = 1.27 × 0.0821 × 353

V = 36.8 L

Thus, the volume occupied by the helium gas is 36.8 L

During the Viking landings on Mars, the atmospheric pressure was determined to be on the average about 6.50 millibars (1 bar = 0.987 atm). What is that pressure in torr and kPa?

Answers

Answer:

The pressure is equal to 4.87 torr and 0.649 kPa.

Explanation:

The atmospheric pressure was determined to be on the average about 6.50 millibars.

As 1 bar = 0.987 atm

6.5 mbar = 0.0065 bar

So,

0.0065 bar = (0.0065×0.987 ) atm

= 0.0064155  atm

Since, 1 atm = 760 torr

So, 0.0064155  atm = 4.87 torr

Since, 1 torr = 133.322 Pa

4.87 torr = 649.27 pa

or

4.87 torr = 0.649 kPa

Hence, the required pressure is equal to 4.87 torr and 0.649 kPa.

Need help with this question please.

Answers

Answer:

12.8

Explanation:

14 = pOH + pH

pH = 14 - pOH

pH = 14 - 1.2

pH = 12.8

what is the electrolysis of water

Answers

the process of using electricity to decompose water into oxygen and hydrogen gas.


1 Write the chemical symbols for following elements: Nitrogen-
Phosphorus- bromine- Zinc-Potassium-Magnesium.

Answers

Answer:

Look below

Explanation:

Nitrogen: N

Phosphorus: P

Bromine: Br

Zinc: Zn

Potassium: K

Magnesium: Mg

Hope this helps(would be very grateful if you mark this answer branliest bc i need for lvl up)

Use the following chemical equation, how many moles of ammonia (NH 3 ) produced when 3.15 moles of nitrogen (N 2 ) reacts with hydrogen (H 2 ) ? N 2(g) + 3H 2(g) 2NH 3(g)

Answers

Answer:

[tex]n_{NH_3}^{produced}=6.3molNH_3[/tex]

Explanation:

Hello there!

In this case, according to the given chemical reaction, it is possible for us to use the 1:2 mole ratio of nitrogen to ammonia to calculate the moles of the latter that are produced when reacting 3.15 moles of the former with hydrogen as shown below:

[tex]n_{NH_3}^{produced}=3.15molN_2*\frac{2molNH_3}{1molN_2}[/tex]

Thus, by solving the equation we obtain:

[tex]n_{NH_3}^{produced}=6.3molNH_3[/tex]

Best regards!

how many grams of ammonia produced from 1000 grams of N2?

Answers

Answer:

N2 + 3H2 ———> 2NH3

As we know 1000 grams ammonia is 58.82 moles so according to unitary method,

2 mole NH3 formed by 1 mole N2 hence 58.82 NH3 will be given by 29.41 moles N2.

No. Of moles = given mass/molar mass

Implies that

Mass of nitrogen required = 29.41*28 = 823.48 grams.

Explanation:

What is the molecular geometry, or shape, of the molecule shown in the image?
A. bent
B. tetrahedral
C. trigonal planar
D. linear

Answers

Answer:

The correct answer to this is C. Trigonal Planner

Explanation:

I got it right..

What is the temperature of an 11.2-L sample of carbon monoxide, CO, at 744 torr if it occupies 13.3 L at 55 °C and 744 torr? 3C The pressure is not changing, so it looks like a case where charles’ law can be use.

Answers

Answer: The tempearture of 11.2 L of CO is [tex]3.0^0C[/tex].

Explanation:

To calculate the final volume of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]

where,

[tex]V_1\text{ and }T_1[/tex] are the initial volume and temperature of the gas.

are the final volume and temperature of the gas.

We are given:

[tex]V_1=11.2L\\T_1=?\\V_2=13.3L\\T_2=55^0C=(55+273)K=328K[/tex]

Putting values in above equation, we get:

[tex]\frac{11.2L}{T_1}=\frac{13.3L}{328K}\\\\T_1=276K=(276-273)^0C=3.0^0C[/tex]

Thus the tempearture of 11.2 L of CO is [tex]3.0^0C[/tex], pressure remaining constant.

Pure gold has a density of 19.3 g/cm³. if it is made into a crown. what will be the density of the crown? how can you find out if the crown is indeed made of pure gold and nothing else?​

Answers

Answer:

19.3g cm^3

If it deviates from the original 19.3g cm^3

calculate the percentage of CL in AL(CLO3)3​

Answers

Answer:

38.4%

Explanation:

We'll begin by calculating the molar mass of Al(ClO₃)₃. This can be obtained as follow:

Molar mass of Al(ClO₃)₃

= 27 + 3[35.5 + (16×3)]

= 27 + 3[35.5 + 48]

= 27 + 3[83.5]

= 27 + 250.5

= 277.5 g/mol

Next, we shall determine the mass of Cl in Al(ClO₃)₃. This can be obtained as follow:

Mass of Cl in Al(ClO₃)₃ = 3 × Cl

= 3 × 35.5

= 106.5 g

Finally, we shall determine the percentage of Cl in Al(ClO₃)₃. This can be obtained as follow:

Mass of Cl in Al(ClO₃)₃ = 106.5 g

Mass of Al(ClO₃)₃ = 277.5 g

Percentage of Cl =?

Percentage of Cl = mass of Cl / mass of Al(ClO₃)₃ × 100

Percentage of Cl = 106.5 / 277.5 × 100

Percentage of Cl = 38.4%

An alternating current complete 100 cycles in 0.1s. it's frequency is​

Answers

Answer:

The frequency is 1000 cycles/s

Explanation:

An alternating current is an electrical current in which the current changes its magnitude and the sense cyclically. The frequency of this current is defined as the cycles that the current completes in one second.

As the current completes 100 cycles in 0.1 seconds, the frequency is:

100 cycles / 0.1s = 1000 cycles /s

The frequency is 1000 cycles/s

A(n) _________ is an atom or a group of atoms with either a positive or negative charge
O compound
O ion
O molecule
O nucleus

Answers

Answer:

the answer is ion..

hope it helps..

The sender for this question would be ion.

Complete the sentence using the correct word: conduction,
convection or thermal energy.
The method of heat transfer that occurs when particles move
through a fluid is called

Answers

Answer:

Convection

Explanation:

Convection definition:

the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.

The method of heat transfer that occurs when particles move through a fluid is called convection.

Convection relies on the principle of fluid flow, where hotter particles become less dense and rise while cooler particles sink due to their increased density.

This movement creates a continuous circulation of the fluid, enabling the transfer of thermal energy. As the hot particles rise, they carry their thermal energy with them, and as the cooler particles sink, they absorb heat from their surroundings.

Convection is also observed in natural phenomena such as ocean currents, air currents, and even the movement of magma in the Earth's mantle.

To learn more about the convection, follow the link:

https://brainly.com/question/4138428

#SPJ6

Explain the difference between an exothermic and an endothermic reaction.

Answers

Answer:

Explanation:

Heat is a reactant.

If the equation requires heat to occur, the reaction is endothermic

The equation would have this model

A + B + heat =====> C + D

If the equation gives away heat, then it is exothermic

The equation would look like this. (I'll use a common reaction)

CH4 + 2O2 - heat ===> CO2 + 2H2O

The heat is minus when it has to be given away.

The glacier given in this picture is an example of which type?

Answers

Answer:

arctic glacier

Explanation:

Answer:

Explanation:

are there any choices to choose from?

if not a glacier is a type of frozen water compacted together...

if it   doesnt have choices ill word it differently...

can u also tell me what is your unit about?

What is the empirical formula for C6H12?

Answers

Answer:

The empirical formula of C6 H12,

Jacob is doing a report on the galaxy in which Earth is found. Which of the following is the galaxy that Jacob should research for his report?


Andromeda

Milky Way

Maffei 1

Ursa Minor

Answers

Answer:

milky way

Explanation:

Which is least likely to occur after an experiment is conducted to a test a hypothesis?
The data is analyzed to see if it supports or refutes the hypothesis.
• The same experiment is conducted again to see if the data are reliable.
The hypothesis becomes a theory if the results support it.
O A new experiment is designed to provide additional data about the hypothesis.

Answers

Answer:

4th one. (A new experiment is designed to provide additional data about the hypothesis.)

Answer:

The correct answer is C)The hypothesis becomes a theory if the results support it.

Explanation:

Combine terms: 12a + 26b -4b – 16a.​

Answers

Answer:

= -4a+22b

Explanation:

i hope this helps :)

Answer:

12a-16a =-4a

26b -4b =22b

the final answer is-4a +22b

What is NaC2H3O2 coefficient

Answers

Answer:yes coefficient u mean??

Explanation:

Which product is often derived from the natural environment?

Answers

Answer:

coal, cotton, chinese tradictional medicine

If aluminum has a mass of 22.3 g, how many liters of oxygen gas are required at STP?

Answers

Answer:

27.8

Explanation:

Electrolysis is used in the electroplating of metals. The same amount of current is passed through separate aqueous solutions of CuSO4, Sn(SO4)2 and Cr2(SO4)3 in separate electrolytic cells for the same amount of time. State and explain which cell would deposit the greatest amount (in mol) of metal. Identify the electrode at which the metal is deposited.

Answers

Answer:

CuSO4 cell will have the greatest amount of deposit among all three. The deposit will occur at the cathode

Explanation:

The valence of the elements in this case is as follows -

Cu - 2e-

Sn - 4e-

Cr - 3e-

CuSO4 cell will have the greatest amount of deposit among all three

The atoms of copper metal will deposit at the cathode. At the cathode, the least number of moles of electrons needed .

Hence, more amount of copper  can be extracted out by the electrolyte

 

Consider the reaction, C2H4(g) + H2(g) - C2H6(8), where AH = -137 kJ. How many kilojoules are released when 3.5 mol of CH4
reacts?
480 kJ are released
20 x 103 kJ are released
570 kJ are released
137 kJ are released​

Answers

Answer: 480 kJ of energy is released when 3.5 mol of [tex]C_2H_4[/tex] reacts.

Explanation:

The balanced chemical reaction is:

[tex]C_2H_4(g)+H_2(g)\rightarrow C_2H_6(g)[/tex]  [tex]\Delta H=-137kJ[/tex]

Thus it is given that the reaction is exothermic (heat energy is released) as enthalpy change for the reaction is negative.

1 mole of [tex]C_2H_4[/tex] on reacting gives = 137 kJ of energy

Thus 3.5 moles  of [tex]C_2H_4[/tex] on reacting gives = [tex]\frac{137}{1}\times 3.5=480 kJ[/tex] of energy

Thus 480 kJ of energy is released when 3.5 mol of [tex]C_2H_4[/tex] reacts.

Other Questions
Qs 5 pleaseeee help!!! Explain one inference scientists made about the interior of the Earth based on seismic waves. Use the words S & P waves in your answer. Use the word refract/bend in your answer if perimeter of a square is 24cm find its area please give me easy formula 2-ciclopropilpropano Point A is located at (3,5) and point B is located at (-2 ,-2).find the distance between point A and B Question 2 of 5What would you call 2-1-1 for?A. Domestic violence counselingB. Product safety informationC. Help after a home break-inD. Help after a domestic violence incidentSUBMIT HELP PLS ASAP I HAVE 6 MINUTES NO LINKS write the expressions for when you translate the graph of y = |x+2| a) one unit up b) one unit down c) one unit to the left d) one unit to the right You have recently visited visited a place while a famous person was there. In your letter you should include the following Describe where you were and what happened Explain what the famous person is doing Say how u felt about the experience Please help, super confused! What is required to make a fire? Is it exothermic or endothermic? The harper family budgeted 37% of their income of $53000 for taxes. How much did they budget for taxes? Which of these CAN be a probability of an event. CHOOSE ALL THAT APPLY!*1.) 0.3484832.) 1.013.) -14.) 0.995.) 06.) -0.5 Find the length of side x in simplest radical form with a rational denominator. Malco Enterprises issued $10,000 of common stock when the company was started. In addition, Malco borrowed $36,000 from a local bank on July 1, Year 1. The note had a 6 percent annual interest rate and a one-year term to maturity. Malco Enterprises recognized $72,500 of revenue on account in Year 1 and $85,200 of revenue on account in Year 2. Cash collections of accounts receivable were $61,300 in Year 1 and $71,500 in Year 2. Malco paid $39,000 of other operating expenses in Year 1 and $45,000 of other operating expenses in Year 2. Malco repaid the loan and interest at the maturity date.Required:Based on this information, answer the following questions.a. What amount of interest expense would Malco report on the Year 1 income statement?b. What amount of net cash flow from operating activities would Malco report on the Year 1 statement of cash flows?c. What amount of total liabilities would Malco report on the December 31, Year 1, balance sheet?d. What amount of retained earnings would Malco report on the December 31, Year 1, balance sheet?e. What amount of net cash flow from financing activities would Malco report on the Year 1 statement of cash flows?f. What amount of interest expense would Malco report on the Year 2 income statement?g. What amount of net cash flow from operating activities would Malco report on the Year 2 statement of cash flows?h. What amount of total assets would Malco report on the December 31, Year 2, balance sheet? i. What amount of net cash flow from investing activities would Malco report on the 2017 statement of cash flows?j. If Malco Enterprises paid a $2,000 dividend during Year 2, what retained earnings balance would it report on the December 31, Year 2, balance sheet? 6 Claims. Evidence Reasoning Howare mitosis and meiosis alike and different?Summarize evidence to support your claimand explain your reasoning. 2) Which best describes the function of this sentence in this passage?" The very best place for children to visit is Portland, Oregon."A)It states the main idea of the argument.B)It defines the terms being used in the argument.C)It provides a supporting reason for the author'sargument.D)It provides a counter-claim to the speaker's mainargument. Consider a buffer made by adding 132.8 g of NaCHO to 300.0 mL of 1.17 M HCHO (Ka = 6.3 x 10) What is the pH of this buffer? Jeremy bought a new pair of jeans. The jeansregularly cost $30, but they are on sale for10% off. There is a 6% sales tax on hispurchase. How much will Jeremy payaltogether for the jeans ? PLZ HELP IF RIGHT I WILL GIVE U BRAINLIST!!Due IN 10 MINS!!!