1. 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
  2. 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
  3. 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
  4. science

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

    asked by annie on November 11, 2016
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  20. math

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

    asked by indira on February 28, 2017
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. Science

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

    asked by Abdul Qudoos on September 24, 2017
  27. 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
  28. 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
  29. 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
  30. 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
  31. 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
  32. 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
  33. 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
  34. 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
  35. 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
  36. 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
  37. 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
  38. 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
  39. 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
  40. 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
  41. 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
  42. Science

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

    asked by Chemistry on November 24, 2016
  43. 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
  44. 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
  45. 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
  46. 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
  47. 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
  48. 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
  49. 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
  50. 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
  51. physics

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

    asked by 7up on October 20, 2016
  52. 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
  53. 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
  54. 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
  55. 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
  56. chemistry

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

    asked by suleiman on January 13, 2019
  57. 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
  58. 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
  59. 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
  60. 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
  61. 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
  62. 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
  63. 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
  64. Chemistry

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

    asked by Jenny on October 4, 2012
  65. 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
  66. 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
  67. 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
  68. phy

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

    asked by christ on January 24, 2013
  69. 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
  70. 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
  71. 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
  72. 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
  73. 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
  74. 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
  75. chemistry

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

    asked by Anonymous on October 25, 2016
  76. 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
  77. 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
  78. 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
  79. Phy113

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

    asked by Ugonnia on February 14, 2013
  80. 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
  81. 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
  82. math

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

    asked by Daniel on April 26, 2013
  83. 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
  84. 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
  85. 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
  86. 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
  87. 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
  88. 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
  89. 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
  90. Science

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

    asked by Dinesh on June 18, 2016
  91. 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
  92. 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
  93. Physics

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

    asked by Danielle on September 4, 2016
  94. 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
  95. 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
  96. 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
  97. 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
  98. 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
  99. 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
  100. 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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