# Calculate the pH of the solute in an aqueous solution of 0.0047 M codeine, if the pKa of itsconjugate acid is 8.21. What is the percentage protonation of the solute?

46,915 questions, page 207-
## Chemistry

Given the following thermochemical equation, calculate the heat (in kJ) involved in decomposing 18.0 g of water to give one mole of H2 (g).

*asked by Zandria on June 14, 2009* -
## Physics

Calculate how much energy is stored in a 17μF capacitor when it is charged to a potential difference of 200 V

*asked by sam on April 24, 2018* -
## Science

An athlete runs on a circular track 7m.calculate the distance and displacement covered by him after 3 rotations?

*asked by Jhon on September 12, 2016* -
## science

a body of mass 10kg is moved in a vertical circle calculate tangential acceleration

*asked by annie on November 11, 2016* -
## chemistry

Calculate the percent error when a student measured a sample of aluminum and obtained a density of 2.5g/mL.

*asked by jonas on September 5, 2012* -
## Chemistry

Calculate [H3O+] in the following solutions. 1) 0.100 M NaNO2 and 5.00×10−2 M HNO2 2) 5.20×10−2 M HCl and 7.62×10−2 M NaC2H3O2 please help thx

*asked by Lol on March 29, 2018* -
## chemistry

Calculate the percent error when a student measured a sample of aluminum and obtained a density of 2.5g/mL.

*asked by Kyle Jackson on September 5, 2012* -
## calculus

Calculate the equation of the tangent and normal lines for the curve f(x) = tan 2x, at the point where the x-coordinate is: x = π/8.

*asked by Bonaventutre on March 27, 2013* -
## Chemistry

how do I find the density of CO2, I am not allowed to look it up and all I have is H202 and ethanol. I don't think I have to use both, but I can't figure out how to calculate it.

*asked by Anonymous on February 6, 2009* -
## science

if the velocity of a progressive wave with a periodic frequency of 10khz is 330m/s.calculate it's wavelength.

*asked by versatile on July 14, 2016* -
## Chemistry

Calculate the mass of a mole of glucose, C6H12O6, in grams. Would I just find the GFM, which comes out to 180.0g?

*asked by Anonymous on October 12, 2009* -
## Chemistry

calculate the volume needed to make 2.20 x 10^2 ml of 0.100M cacl2. what would be the total concentration of the final (Cl-) alone?

*asked by Lyn on November 30, 2016* -
## Physics

Calculate the skid-to-stop of a car travelling oa a road at 100km/h with a coefficient of friction of 0.68.

*asked by skid on September 8, 2016* -
## physics

11. The horizontal range of a projectile is 4 3 times of its maximum height. Calculate the angle of projection.

*asked by chimatiro on March 27, 2019* -
## Chemistry

Calculate the number fo moles of NaOH(aq) needed to react completely with 125 mL fo 6.00 M H2SO4(aq)

*asked by Sam on October 20, 2012* -
## chemistry

calculate how much strontium fluoride will dissolve in 1L of water given Ksp= 2.5x10^-9 at 25 degree celsius

*asked by lily on June 3, 2012* -
## physics

Calculate the speed of sound wave in air if its frequencies and wavelengths are 256Hz and 1.32m

*asked by Melissa on June 3, 2012* -
## Physics

Two charges each of 40 microcoulomb are placed at a distance of 0.4 M. calculate the potential at the midpoint. Dielectric constant of the medium is 2.

*asked by Prapti on May 4, 2018* -
## chemistry

Calculate the current required to transfer 0.015 mols of electrons in a time of 20 min

*asked by Priya on April 22, 2008* -
## math

A circular pie was cut into 6 equal slices. Calculate the angle formed by each slice.

*asked by indira on February 28, 2017* -
## statistics

Calculate the probability of meeting a scheduled time of 50 units for the PERT network shown below:

*asked by ELlis on November 15, 2012* -
## Science

Calculate the amount of water produced by the combustion of 44g of propane and 16g of methane.

*asked by Praneetha N Upadhyaya on July 14, 2016* -
## Science

Calculate the linear momentum of a pickup truck that has a mass of 1100 kg and is traveling eastward at 22 m/s.

*asked by Audible on June 13, 2013* -
## science

calculate the time taken by a train to travel 1000m if its initial speed is 30m/s and it has an acceralation of 0.1m/s

*asked by daniel on April 16, 2013* -
## Chemisty

Calculate the standard enthalpy change for the following reaction at 25 °C. MgCl2(s)+H2O(l)-->MgO(s)+2HCl

*asked by Orton on April 1, 2013* -
## Science

Bullet of mass 30g travels at a speed of 1500m/s,calculate its kinetic energy.

*asked by Abdul Qudoos on September 24, 2017* -
## physics

a body is moving with uniform acceleration of 10m/s2.if it starts from rest calculate its displacement after 5s

*asked by Anonymous on May 21, 2013* -
## physics

Calculate the internal energy of 25.0 g of low-density oxygen gas (O2) at a temperature of 255 K.

*asked by JOHN on April 13, 2012* -
## Financing

(a) How do you calculate manufacturing overhead costs to the two products using activity based costing (ABC).

*asked by Fred on June 28, 2009* -
## physics

a body is moving with uniform acceleration of 10m/s2.if it starts from rest calculate its displacement after 5s

*asked by Anonymous on May 21, 2013* -
## science

if the velocity of a progressive wave with a periodic frequency of 10KHz is 330m/s. calculate it's wavelength.

*asked by iornav Gideon on July 10, 2016* -
## chemistry

Calculate the increase of entropy in J/K when 8.6 mole of C 2 H 5 OH melts at (-114) o C and 1 atm. ΔH fus = 5.02 kJ/mol

*asked by carl on March 31, 2013* -
## math

the side of a tetrahedron .if the base of each triangle is 8 cm and the height 6.9cm,calculate the surface area

*asked by Anonymous on June 10, 2013* -
## Science

Calculate the wavelength, λ, in meters of a photon capable of exciting an electron in He+ from the ground state to n = 4.

*asked by Anonymous on March 2, 2013* -
## Mathematics

Calculate the length of time for $400 to earn $160 if invested at 8% per annum, thank you in advance.

*asked by Eye Clinic on February 25, 2019* -
## Chemistry

In procent how much etanol with 10% metanol in water to mix because i must calculate to have liquid freeze to -20C?

*asked by Mia on October 17, 2012* -
## Chemistry

Solve an equilibrium problem (using an ICE table) to calculate the of each of the following solutions. .16M CH3NH3Cl

*asked by Dillon on March 30, 2013* -
## Chemistry

Calculate the volume of carbon 4 oxide gas at s.t.p when 5g of zinc trioxocarbonate is heated strongly.

*asked by Emmanuel on October 15, 2018* -
## science

Calculate the fraction of atoms in a sample of argon gas at 365 K that has an energy of 11.0 kJ or greater.

*asked by Hannah on February 9, 2013* -
## physics

A force of 291.0 N is used to push a 140 kg mass 30.0 m horizontally in 3.00 s. Calculate the power developed in kW.

*asked by Mara on December 14, 2008* -
## Science

Calculate the time needed for a net force of 5N to change the velocity of a 10kg mass by 2m

*asked by Navya on February 23, 2017* -
## Science

Calculate the gram molecular mass of nitrogen if 360cc at STP weigh 0.45g.

*asked by Chemistry on November 24, 2016* -
## physics

Calculate the net force required to give a 3000 kg truck an acceleration of 2.5m per squared

*asked by Natasha on October 15, 2018* -
## stats

n a study using 15 respondents and in which the population variance is unknown, what distribution should be used to calculate the confidence interval.

*asked by Anonymous on September 2, 2012* -
## chem

Given the following wavelength of light, calculate the energy of one photon in Joules. λ = 1 x 10^0 meters what does it mean? i don't know what to do or how to solve

*asked by will.i.am on February 11, 2013* -
## maths

Two vectors P and Q of magnitudes 5 and 3 units respectively are inclined at an angle of 30 to each other.calculate the component of the resultant in the direction of Q.

*asked by joe on November 15, 2016* -
## Physics

Calculate the length of a displaced pendulum Bob which pass through its lowest point twice every second. Take g=10m/s²

*asked by Majiri on September 16, 2017* -
## PHYSICS

AN OBJECT MASS OF 10KG IS PLACED ON AN INCLINED PLANE AT 30 degree at the horizontal calculate recreation between two su

*asked by MUTIAT on September 23, 2017* -
## math

Please help me. Thank you! I need help freshing my memory. How do you calculate the slope of a horizontal and a verticle line? I remember how to do a diagonal but that's it. Please and thank you.

*asked by Amy on January 14, 2009* -
## Science

An electron in Li2+ falls from n = 2 to the ground state. Calculate the wavenumber, (νˉ), of the emitted photon.

*asked by Anonymous on March 2, 2013* -
## physics

Calculate the velocity time graph of a body at rest is given an initial uniform acceleration .

*asked by 7up on October 20, 2016* -
## Chemistry

50.0 mL of 0.116 M NaOH is titrated with 0.0750 M HCl. Calculate the pH after the addition of 5.0 mL volume of acid.

*asked by Nathan on May 1, 2013* -
## Chemistry

After 0.69 g of CoCl2⋅6H2O is heated, the residue has a mass of 0.333 g . Calculate the % H2O in the hydrate.

*asked by cant tell ya on April 10, 2019* -
## cHEMISTRY

CALCULATE THE HEAT ENERGY JUST AFTER MIXING AS (mCpT) for the total mass of water, using Cp=4.184J/g-c

*asked by Anonymous on April 18, 2012* -
## physics

An object is projected at an angle of elevation of 45 degree with a velocity of 100 m/s calculate its range

*asked by tsering on January 29, 2017* -
## chemistry

calculate the volume of oxygen required for cmmplete combution of20cm3 of (C2H2) ethyne

*asked by suleiman on January 13, 2019* -
## chemistry

Calculate the wavelength, λ, in meters of a photon capable of exciting an electron in from the ground state to n = 4.

*asked by adex on February 25, 2013* -
## Chemistry

Calculate the enthalpy change for the melting of a 30 g ice cube. Show all your steps. Any help is appreciated! :)

*asked by anonymous on November 10, 2008* -
## chemistry

Calculate the molar mass of a gas if 4.40g occupies at 3.50 L at 560mmHg and 41 degrees celsisus

*asked by to on March 21, 2017* -
## AP Chem

Calculate the pH and % ionization for each of the following acids.a. 0.15 M HNO3b. 0.10 M HCNc. 0.40 M HFd. 0.10 M HClO2 I have no idea how to do this? In clas we had a Ka but none was given here... Please Help! Thank You

*asked by Kelly on February 4, 2018* -
## Chemistry

Calculate the number of moles in this quantity: 250 ml ethyl alcohol,C2H5OH(=0.789 g/ml)

*asked by Anonymous on December 14, 2012* -
## physics

Calculate the electrical attraction that a proton in a nucleus exerts on an orbiting electron if the two particles are 1.13×10^-10 m apart.

*asked by Erin on September 5, 2008* -
## Hess's law

I need some help with this one please... A+B ----> 2 D H= -765.3 kj S= 344 j/k C ------> D H= 521 kj S= -171 j/k calculate G at 298 K for A+B ------> 2C I know I need to use the formula G= H-TS but I don't know how to get the numbers.

*asked by Caitlin on March 20, 2013* -
## Chemistry

Portland cement contains some SiO2. Calculate the mass percent composition of silicon in this compound.

*asked by Jenny on October 4, 2012* -
## Chemistry

After 0.69 g of CoCl2⋅6H2O is heated, the residue has a mass of 0.333 g . Calculate the % H2O in the hydrate.

*asked by just need help on April 10, 2019* -
## algebra 1

if you go from one point to the other do you subract the a and b or do you do all points in between to find the elevation? I'm not sure what this question refers to. Are you trying to calculate slopes?

*asked by jamie on September 5, 2006* -
## science

calculate the cost of using a 100w lamp for 10 hours if electrical energy costs 11.3 per kwh

*asked by georgie on September 11, 2009* -
## phy

Calculate the average translational kinetic energy of a nitrogen molecule at 27 degree celcius

*asked by christ on January 24, 2013* -
## chemistry

Calculate the number of grams of acetic acid present in the mixture after the reaction is complete.

*asked by Anonymous on January 29, 2013* -
## Physics

Calculate the change in kinetic energy of a 2.50kg cat slowing down from 1.00m/s to 0.500m/s.

*asked by help on October 22, 2018* -
## maths

calculate differentiation of cos x to x using first principle of derivative. Find the value of differentiated function , if x = 270°

*asked by rajkaur on January 12, 2019* -
## Math

A map is drawn to a scale 0f 1 :20 000. Calculate the area of a a lake that measures 3 square km

*asked by Erica on January 27, 2017* -
## Physics

Calculate the kinetic energy of an elephant (mass = 5 tonnes) charging at a speed of 36km/h.

*asked by help on October 22, 2018* -
## Chemistry

calculate the mass of chlorine gas contained in 5.00dm³ flask at 25°C and 98 kpa pressure?

*asked by Jessica on April 10, 2019* -
## chemistry

Calculate the mass of oxalic acid needed to prepare 150 ml of 0.442 M C2H2O4.

*asked by Anonymous on October 25, 2016* -
## science

Calculate the number of ions present in 7.45 grams of potassium oxide. ( At.mass of K= 39u).

*asked by elby on July 3, 2017* -
## CHEMISTRY

(c) Calculate the degree of polymerization n of polystyrene with a molecular weight of 3.091×106 g/mol.

*asked by lena on January 5, 2013* -
## Accounting

I need to make a Bond with discount and I do not know how to and where to find the instructions to do so. The part that I'm having the most trouble with is the interest, how to calculate it? HELP!

*asked by Lizmarie on September 15, 2006* -
## Phy113

Calculate the average traslation kinetic energy of a nitrogen molecule at 27 degree celcius

*asked by Ugonnia on February 14, 2013* -
## Physics

the speed of a train increases from 15 mi/h in a distance of 500 ft. calculate the average acceleration in ft/s squared

*asked by Amel on March 12, 2017* -
## Finance

I did to get better clarification on how need to find the degree of operating leverage and how to calculate this, based on the information that I have - please help. I am not getting this piece..ty

*asked by maryk on October 16, 2009* -
## math

Jeff takes a loan of R25000 in a period of 5years calculate the interest rate?

*asked by Daniel on April 26, 2013* -
## Chemistry

The solubility product for Ni(OH)2(s) is 1.6 ✕ 10−16. Calculate the value of ℰ° for the following half-reaction. Ni(OH)2 + 2 e− → Ni + 2 OH − I have no idea what equation to use or how to solve this problem

*asked by Elizabeth on May 11, 2018* -
## chemistry

Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n=5 to n=1 in J.

*asked by ariel on February 6, 2017* -
## science

calculate the change in entropy when 1.00g of oxygen at 27 degree celsius is expanded from 1 dm 3 to 4 dm3

*asked by Anonymous on February 27, 2013* -
## physics

An object is projected at an angle of elevation of 45 degree with a velocity of 100m/s. Calculate it's range

*asked by anees on November 30, 2016* -
## Chemistry

Calculate the new volume of 23.5 mL of N2 gas initially at 220k Pa and 98.7 degrees Celsius when converted to STP

*asked by Anonymous on March 4, 2017* -
## college math

Calculate the area of a circular patio that has a radius r = 3yd. Use 3.314 The formula be A = (3.14) x 3 x 3 the answer 28.26

*asked by Lourane on June 1, 2012* -
## science

The rate constant of a certain reaction is given by log K= 212/T Calculate the activation energy at 400K.

*asked by Aditi Arya on July 17, 2016* -
## Science

Calculate average velocity of a minute hand of 5cm long from between 6am to 6:30am

*asked by Dinesh on June 18, 2016* -
## math

calculate the average percent 1970 1980 1990 2000 17.2 17.3 17.1 16.6 do you add them all together then divide by 4

*asked by deb on April 30, 2012* -
## Chemistry Science

. When a 28.7 g sample of KI dissolves in 60.0 g of water in a calorimeter, the temperature drops from 27.2oC to 13.2 oC . Calculate ΔH for the process.

*asked by science girl on May 29, 2012* -
## Physics

Calculate the work done by a 300N Force moving a 20kg object a distance of 50m

*asked by Danielle on September 4, 2016* -
## Calc.

For the function ƒ(x) = x^3 - 8x + 3, calculate where a = 5 and h = 2. Simplify before substitution (the simplifying is where I am having problems...not sure if my answer is right). Thanks. Using the limits equation.

*asked by Derek on July 14, 2008* -
## math

How much time required to fill the 1000litre water tank with 2 inch pipe How it calculate

*asked by vimalraj on March 19, 2017* -
## Science

An arrow is shot vertically upwards with an initial velocity of 14 m/s . Calculate the height reached

*asked by Nadia on September 5, 2016* -
## physics

calculate the friction force of an object? if weight=19600,vi=30ms-1,vf=0ms-1 and S=100m.

*asked by sana on January 7, 2013* -
## science

A body is dropped the roof of a building 10 mtr high calculate the time and speed g =10 m/s

*asked by Paul on August 1, 2017* -
## Physical Sciences

How do I calculate the initial velocity of a ball if i've only given a maximum height of 12metres above its starting point?

*asked by Amanda on January 25, 2013* -
## college chem

calculate the amount of heat (in kj) required to convert 140.1 g of water to steam at 100c

*asked by luis fernandez on February 4, 2013*

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