# If the relative atomic mass of CH2O is calculated it's empirical formula (C=12,H=1,O=16)

46,086 questions, page 115
1. ## Stats

In a distribution of scores with a mean of 234 and a standard deviation of 47, what is in the 43rd percentile ? and what formula do i use ?

asked by Ruben on February 26, 2011
2. ## Math

Is there a mathematical formula to calculate this easily? 1 x 2 x 3 x 4 x 5...50 I know it's not an arithmetic/geometric series because that means 1 + 2 + 3 + 4 + 5...50

asked by Anonymous on February 4, 2008
3. ## Chemistry

How many grams would you need to weigh out in order to have 2.7 x 1021 formula units of LiCl? i am so confused :(

asked by Yasmen on May 24, 2013
4. ## Math

Calculate the weight of 6.022 into 10 to the power 23 formula units of calcium carbonate

asked by Deepak on August 4, 2017
5. ## math

someone please help me slove this problem. Use the qudratic formula to find any x-intercepton the graph of the equation. y=4x^2-2x-5

asked by Michael on April 24, 2013
6. ## math

another cylinder question volume formula is pi r-sqrt*h the dimensions are 8 inches with a 1.6 radius

asked by meshel on March 30, 2016
7. ## Chemistry

Write the condensed structural formula for each of the following molecules: a.ethylcyclopropane b. methylcyclohexane c. isopropylcyclopentane

asked by Elisabeth on July 20, 2010
8. ## Physics

Two resistors 10 Ù and 5 Ù are connected in parallel across a 15 V battery. What is the potential difference across the 10 Ù resistor? Which formula do I use?

asked by justonequestion on February 2, 2013
9. ## Math

Determine the coefficient of the 3rd term in the expansion of (x+2y)^7. I tried using the formula,nCk (a^(n-k)) ((b)^k), but it doesn't indicate what n is.

asked by sh on June 19, 2009
10. ## chemistry

How do I predict the formula for the ionic compounds when I combine? Cr(+3) and chlorate Na(+1) and carbonate K(+1) andsulfate

asked by lizzy on March 12, 2008
11. ## Chemistry

Caslcualte the formula massfor each of the following compunds CS2 C6H12O6 Fe(nO3)3 C7H16

asked by Amee on March 4, 2013
12. ## calculus

Let g be the function give by g(x) = x^4 - 4x^3 + 6x^2 – 4x + k where k is constant. A.On what intervals is g increasing? Justify your answer. B.On what interval is g concave upward? Justify your answer. C.Find the value of k for which g has 5 as its

asked by Equihua on January 4, 2013
13. ## AP Chemistry

a student titrates three samples of 0.3% hydrogen peroxide solution made from a bottle of 3% hydrogen peroxide solution dated 10/31/2007. would you expect the calculated molarities of the samples to be higher or lower than the following values: trial 1:

asked by Gabriella on October 5, 2013
14. ## physics

A train at a constant 43.0 km/h moves east for 20.0 min, then in a direction 54.0° east of due north for 25.0 min, and then west for 30.0 min. What are the (a) magnitude and (b) angle (relative to east) of its average velocity during this trip?

asked by barich on September 24, 2015
15. ## chemistry

In a laboratory experiment, a 18.0 ml sample of NaCl solution is poured into an evaporating dish with a mass of 24.00 g. The combined mass of the evaporating dish and NaCl solution is 37.15g. After heating, the evaporating dish and dry NaCl have a combined

asked by Allyse on October 9, 2010
16. ## chemistry

Please judge my answer Question:A solution of AgNO3 (45 mL/0.45 M) was mixed with solution of NaCl (85 mL/1.35 x 10-2 M) a) Calculate the ion product of the potential precipitate. b) Would a precipitate form? The Ksp of AgCl(s) is 1.8 x 10-10. Answer: For

asked by Abigail on April 15, 2008
17. ## physics

suppose the force of 20.0 N pushes on two boxes of unknown mass. We know, however, that the acceleration of the boxes is 1.25 m/s2 and the contact force has a magnitude of 2.73 N. (a) Find the mass of box 1. (b) Find the mass of box 2. So do I subtract the

asked by Alex on October 11, 2014
18. ## Physics

An astronaut is taking a space walk near the shuttle when her safety tether breaks. What should the astronaut do to get back to the shuttle? Answer: Take a tool from her tool belt and throw it away from the shuttle. Next Question:Assuming that the

asked by Anonymous on October 13, 2009
19. ## Physics URGENT!!!

Gayle runs at a speed of 9.00 m/s and dives on a sled, initially at rest on the top of a frictionless, snow-covered hill, that has a vertical drop of 20.0 m. After she has descended a vertical distance of 4.00 m, her brother, who is initially at rest, hops

asked by Anonymous on October 19, 2012
20. ## Physics URGENT!!!

Gayle runs at a speed of 9.00 m/s and dives on a sled, initially at rest on the top of a frictionless, snow-covered hill, that has a vertical drop of 20.0 m. After she has descended a vertical distance of 4.00 m, her brother, who is initially at rest, hops

asked by Anonymous on October 17, 2012
21. ## physics

A 0.43 kg object connected to a light spring with a spring constant of 21.4 N/m oscillates on a frictionless horizontal surface. The spring is compressed 4.0 cm and released from rest. (a) Determine the maximum speed of the mass. (b) Determine the speed of

asked by roro on October 21, 2012
22. ## CHEM

A 1.000g mixture of As4S6(s) and As4S4(s) was burned in excess O2. The products were As4O6(s) and SO2(g). The solid product had a mass of 0.905g. Find the mass % of As4S4(s) in the original mixture.

asked by ANN on September 30, 2014
23. ## Physics

Lillian (mass 46.0 Kg) standing on slippery ice catches her leaping dog (mass 15 kg) moving horizontally at 4.0 m/s. What is the speed of lillian and her dog after the catch. momentumdoginitial=momenumCombinationafter 15*4=(46 +15)v solve for v.

asked by jennifer on September 27, 2006
24. ## Physics

If the flagpole has a mass of 21 kg and length 10 m and the angle the cable makes with the pole is ϕ = 20°, what are the magnitude and direction of the force exerted by the hinge on the flagpole? Assume the mass of the pole is distributed uniformly.

asked by J Velji on November 22, 2010
25. ## maths,science, physics

A toy locomotive of mass 420g moving at 30cm s^-1 south collides with a carriage of mass 200g moving at 30cm s^-1 north. If they become couple together, what is their common velocity after the collision?

asked by Oxy on June 5, 2016
26. ## Physics

three bugs that are connected by a mass less spider silk are pulled along a frictionless table top. The first bug has a mass of 1.5 g, the second, 2.0 g, and the third, .75 g. The spider pulling them exerts a force of 0.011 N. What is the acceleration of

asked by Kelly on December 5, 2012

Assume that the fish have an average mass of 280g. The average caloric value is 8kcal/g. The heron is able to digest 60% of the fishes’ mass. How many will it need to eat to sustain its caloric intake of 3,000kcal/day?

asked by Aidan on September 20, 2012
28. ## physics

An object of an unknown mass is attached to an ideal spring with force constant 120 N/m and is found to vibrate with a frequency of 6.00 Hz. Find (a) the period, (b) the angular frequency, and (c) the mass of this object.

asked by collegekid on November 16, 2009
29. ## statistics!

The following data represents the body mass index in a random group of twelve diabetic patients in a clinic. 18, 28, 31, 14, 25, 21, 22, 28, 35, 29, 27, 22. What is the z score of the person with the lowest and highest body mass index?

asked by joane on October 24, 2012
30. ## calculus

A force of 13 N is needed to keep a spring with a 2-kg mass stretched 0.25 m beyond its natural length. The damping constant of the spring is c = 8. If the mass starts at the equilibrium position with a velocity of 0.5 m/s, find its position at time t.

asked by nicholas on July 16, 2012
31. ## Physics

A puck of mass m = 1.26 kg slides in a circle of radius r = 25.0 cm on a frictionless table while attached to a hanging cylinder of mass M = 2.04 kg by a cord through a hole in the table. What speed keeps the cylinder at rest? _________m/s

asked by Jane on October 30, 2009
32. ## Physics

A bullet of mass 50g is fired with a velocity of 200m/s in to a block of mass 950g at rest. Given the block can more firely, calculate: 1) the kinetic energy after impact 2) the lose of energy

asked by OLANREWAJU on June 26, 2018
33. ## physics

A balloon of total mass 840 kg is rising vertically with constant speed. As a result of releasing some ballast, the balloon immediately accelerates at 0.5 m/s². Calculate the mass of the ballast released.

asked by Ava on April 6, 2012
34. ## Chemistry

please explain how % error and % yield would have effected the mass/moles of a substance in a reaction in a lab. In this case mass/moles of NaCl. NaHCO3+ HCl--> NaCl + CO2 + H2O

asked by john on December 10, 2012
35. ## physics

a uniform rod of mass M is hinged at its upper end. A particle of mass m moving horizontally strikes the rod at its midpoint elastically. If the particle comes to rest after collision find the value of M/m

asked by OINDRILA on November 20, 2012
36. ## chemistry

The mass of solute per 100 mL of solution is abbreviated as (m/v). Mass is not technically the same thing as weight, but the abbreviation (w/v) is also common. How many grams of sucrose are needed to make 655 mL of a 36.0% (w/v) sucrose solution?

asked by jackson on November 17, 2014
37. ## Chemistry

A solution containing 0.100 mol of Na2CO3 and 0.100 mol of NiCl2 is allowed to react. What mass of precipitate forms in this reaction? I think I know how to do it but don't understand. Do I figure out the mass of each of the compounds? HELP please!!!

asked by STAT on February 25, 2013
38. ## chem

7.82 SILVER(I) NITRATE REACT WITH POTASSIUM CHLORIDE FIND THE BALANCED CHEMICAL REACTION USING THE GIVEN MASS FIND THE MASS OF THE REAGENT. ALSO CALCULATE THE MASSES OF THE PRODOUCT FORMED IN THE REACTION

asked by sam on September 20, 2011
39. ## Physics

A hanging block of mass X is pressed with a force F at angle theta to the vertical against a frictionless wall and is connected to another hanging block of mass Y by a pulley system. What is the expression for the acceleration of Y?

40. ## chem

hemoglobin, the oxygen-carrying protein in red blood cells, has four iron atoms per molecule and contains .340 percent iron by mass. calculate the molar mass of hemoglobin! thanks! :)

asked by skye on August 16, 2012
41. ## chemistry

2 C3H6(g) + 2 NH3(g) + 3 O2(g) → 2 C3H3N(g) + 6 H2O(g) a. What mass of acrylonitrile can be produced from a mixture of 1.24 kg of propylene (C3H6), 1.61 kg of ammonia, and 1.90 kg of oxygen, assuming 100% yield? b. What mass of water is produced?

asked by Anonymous on October 18, 2013
42. ## chemistry

A 15.0ml sample of NaCL solution has a mass of 15.78g.after the NaCL solution is evaporated to dryness, the dry salt residue has a mass of 3.26g. calculate the following concentrations for the %(m/m), % (m/v), molarity (M)

asked by jack on November 1, 2012
43. ## physics

A Bullet of a mass 10g is shot into a water melon of a mass 0.2 kg which is resting on a platform. At the time of impact, the bullet is travelling horizontally at 20 m/s. calculate the common velocity just after impact

asked by The OkomE on April 25, 2019
44. ## physics

A copper of mass 400g is heated until it's temperature becomes 250degree celcius. It is dropped into water weighing 200g at 50 degree celcius.calculate the mass of water vapour produced.

asked by christy on February 24, 2016

A 1.2 m diameter wagon wheel consists of a thin rim having a mass of 11 kg and six spokes, each with a mass of 1.1 kg. Find the moment of inertia of the wagon wheel for rotation about its axis. Answer in units of kg · m2

asked by Amber on April 20, 2012
46. ## Chemistry

10.5g of zinc was heated to a constant mass and the residue treated with excess Hcl: ZnCo3+Hcl-----ZnCl2+Co2+H2O. Calculate the mass of zinc chloride that would be obtained

asked by Peace on April 1, 2016
47. ## physical

A bullet of mass 0.01 kg is moving horizontally with a speed of 100 m/s when it hits a block of mass 2 kg that is at rest on a horizontal surface with a coefficient of friction of 0.4. After the collision the bullet becomes embedded in the block.

asked by dhaval on January 26, 2012
48. ## Physics

A block of mass 2.5 kg hangs vertically from a frictionless pulley of mass 6.5 kg and radius 16 cm. Treat the pulley as a disk. Find: a) the acceleration of the block b) the tension in the rope I don't even know where to begin,

asked by Ana on November 27, 2016
49. ## physics

a black ball of mass 2kg moving at velocity 10m/s collide with a stationary white ball of mass 3kg.find their common velocity if they stick together after collision?

asked by javeria on March 27, 2019
50. ## Physics

a 2 kg mass and a 3 kg mass are attached to a lightweight cord that passes over a frictionless pully. the hanging masses are left free to move. a. in what direction will the smaller masses move? b.what will be its acceleration

asked by chris on December 5, 2012
51. ## Quantum Physics

An electron and a proton each have a thermal kinetic energy of 3kBT/2. Calculate the de Broglie wavelength of each particle at a temperature of 2170 K. (kB is Boltzmann's constant, 1.38×10-23 J/K. The mass of the electron is 9.11×10-31 kg and the mass of

asked by Sam on April 15, 2010
52. ## Physics

A floodlight with a mass of 20.0 kg is used to illuminate the parking lot in front of a library. The floodlight is supported at the end of a horizontal beam that is hinged to a vertical pole. A cable that makes an angle of 30 degrees with the beam is

asked by Jessica on March 10, 2008
53. ## physics

three point particles are fixed in place in an xy plane. Particle A has mass mA = 3 g, particle B has mass 2.00mA, and particle C has mass 3.00mA. A fourth particle D, with mass 4.00mA, is to be placed near the other three particles. What (a) x coordinate

asked by Anonymous on January 2, 2011
54. ## physics

these values were obtained as the mass of a bar of metal: 8.83g 8.84g 8.82g the known mass is 8.83g the values are both accurate and precise- true or false

asked by tisha on September 10, 2013
55. ## Chemistry

the gaseous product of a reaction is collected in a 25.0L container at 27c. the pressure in the container is 300.0 kpa and the gas has a mass of 96.0g. what is the molar mass of the gas?

asked by Destiny on December 12, 2011
56. ## PHYSICS

A marble with a mass of 0.5 kg is moving to the right at 1.25 m/s and a second marble with a mass of 0.35 kg is moving to the left at 2.15 m/s. If they collide head on and the collision is elastic find the final velocities of the two marbles

asked by DAVID on December 11, 2015
57. ## chemistry

ok this problem has made me crazy , 15 % is w\v ok , so i just the m1 , the mass of naoh i don't need the volume , so ill reformulate the problem again , I need the mass of naoh with conc.15% w/v in 176 g h2so4 ok

asked by auro on March 19, 2011
58. ## physics

A frog in a hemispherical pod finds that he just floats without sinking in a fluid of density 1.30 g/cm3. If the pod has a radius of 3.00 cm and negligible mass, what is the mass of the frog?

asked by julie on January 7, 2011
59. ## Physics

A body moving with a velocity at 10 ms collides with a stationery box of mass 100 kg.I f the body has a mass of 50 kg and the two move together after collision.Find their final velocity?

asked by Isaac on January 18, 2016
60. ## Chemistry

If a plant has 88.0 g carbon dioxide and 64.0g water available for photosynthesis determine: a the limiting reactant b. the excess reactant and the mass in excess c. the mass of glucose produced

asked by Lou on April 29, 2014
61. ## Physics

A body moving with a velocity at 10 ms collides with a stationery box of mass 100 kg.I f the body has a mass of 50 kg and the two move together after collision.Find their final velocity?

asked by Isaac on January 18, 2016
62. ## Chemistry

Calculate the mass of Glauber's salt needed to lower the temp of air in a room by 6.3 C. The mass of air in the room is 555.4 kg, the specific heat is 1.2J/g-c

asked by Tara on October 24, 2011
63. ## science

suppose you had two samples of the same radioactive isotope. one sample had a mass of 25 grams. the other had a mass of 50 grams. would the same number of particles be ejected from each sample in the first hour? explain

asked by hannah on November 11, 2010
64. ## chemistry

commercial bleaching solution contains 5.25% by mass of NaClO in water.It has density of 1.08 g/mL. Calculate the molarity of the solution. (HINT:molar mass of NaClO 74.4 g/mol.)

asked by Ayana on May 18, 2019
65. ## Physics

An astronaut of mass 70 kg carries an empty oxygen tank of mass 14 kg. He throws the tank away from himself with a speed of 3 m/s. With what velocity does the astronaut start to move through space?

asked by Dylan on January 15, 2012
66. ## chem

mass of element = 311.1269 amu what is mass of 1.36 moles of these atoms in g Hint: (1 mol = 6.022 x 1023 atoms) and (1 amu = 1.6606 x 10-24 g) HELP!

asked by Mike on October 15, 2007
67. ## physics

A body of mass M1 collides elastically with another body of mass M2 at rest. After collision the velocity of M1becomes ¾ times of the velocity. Find the ratio of their masses

asked by pramod on March 27, 2012
68. ## science

what eventually happens to medium mass stars? i know small stars don't die out as quickly as more massive ones, but i'm having a hard time figuring out what happens to the medium mass ones. thank you.

asked by vanessa on February 18, 2009
69. ## Science

A bullet of mass 10gm is fired from a gun of mass 1kg with a velocity of 100m/s. calculate the ratio of kinetic energy of the bullet and the gun.

asked by Ganesh on February 22, 2018
70. ## Physics

A bullet of mass 35g strikes a stationary wooden block of mass 2.6kg, becomes embedded in the block, and they both move off at 7.5m/s. What was the original velocity of the bullet?

asked by Sarah on May 9, 2012
71. ## PHYSICS

a truck with a mass of 5000 kg and a velocity of 15.0 m/s collides head-on with a car whose mass is 1000 kg, moving at 30.0 m/s. if the two vehicles move together after the impact, at what velocity do they move?

asked by LL on October 1, 2015
72. ## PHYSICS!

An air mattress is 2.36 m long, 0.640 m wide, and 12.2 cm deep. If the air mattress itself has a mass of 0.252 kg, what is the maximum mass it can support in fresh water?

asked by EMM on October 28, 2012
73. ## physics

A 4.75 mass was dropped from a certain height and achieved a maximum velocity of 7.68 m/s just before striking the ground. Determine the height from which the mass was dropped. Ignore air drag.

asked by John on January 8, 2013
74. ## physics

Calculate the gravitational force between the Sun and Neptune. The mass of the Sun is 1.99×1030 kg. The mass of Neptune is 1020×1023 kg. The distance between them is 450×1010 m.

asked by Jane on February 26, 2011
75. ## physics

A bullet of mass 100g is fired at avelocity 100m/s into a wooden block of mass 900g.If the bullet gets embeded into the block,then what would be the velocity of the system?

asked by meenu on April 21, 2014
76. ## Chemistry

Make sure the water’s Mass is still set to 1.0 kg and its Temp is 25 °C. Set the cylinder’s Height to 500 m. How does doubling the mass affect the temperature change of the water?

asked by Kaylee on October 22, 2013
77. ## chemistry

What mass in grams of an aqueous hydrochloric acid solution that is 37.0% by mass hydrogen chloride is needed to supply 2.000 moles of hydrogen chloride?

asked by Li on October 4, 2011
78. ## Maths IX

The mass of a solid sphere of metal 5cm in diameter is 6.25 kg. Find the mass of a spherical shell of same metal, the external diameter being 10cm and thickness 1 cm.

asked by maqbool on April 10, 2017
79. ## chemistry

Copper (II) flouride contains 37.42% F by mass. Use this percentage to calculate the mass of flourine (in grams) contained in 35.6 g of copper (II)fluoride. --- How many grams of Cl are present in 55g of CFCl3?

asked by Anonymous on March 26, 2008
80. ## Physical

An object of mass 100 kg is tied to the bottom of a pond with a light chain. If the tension in the chain is 200 N, what is the mass of water displaced by the object ?

asked by Dicky on November 1, 2016
81. ## science

A body of mass 20kg moving with a velocity of 8m/s collides with a stationary body of mass 10kg and the two stick together.They then move with a common velocity V.Find the value of V.

asked by emmanuel on August 26, 2015
82. ## physics! center of mass

a long non uniform board of length 8 m and mass m = 12 kg is suspended by two ropes if the tensions in the ropes are mg/3 (on left) and 2mg/3 (on right) what is the location of the board's center of mass thank you!

asked by liz on October 7, 2010
83. ## physics! center of mass

a long non uniform board of length 8 m and mass m = 12 kg is suspended by two ropes if the tensions in the ropes are mg/3 (on left) and 2mg/3 (on right) what is the location of the board's center of mass thank you!

asked by liz on October 7, 2010
84. ## Physics

Calculate the force of gravity between a newborn baby of mass 4 kg and the obstetrician of mass 75 kg, who is 0.5 m from the baby. N Which exerts more gravitational force on the baby, Mars or the obstetrician, given that Mars has a mass of 6.4 1023 kg and

asked by Sharvani on October 25, 2012
85. ## Spanish

i need help translating these sentences. only using the verb "estar" 1. My grandfather took my brother to the university. 2. My best friend is my work colleague. 3. It's my boyfriends necktie. 4. My female cat is in the garden. 5. My male cousin and I had

asked by Elizabeth on April 9, 2012
86. ## math volume

Tommy decided to also make a sampler can with a diameter of 2 inches and a height of 3 inches. Tommy calculated that the area of the base was es002-1.jpg, and multiplied that by the height of 3 inches for a total volume of es002-2.jpg. Explain the error

asked by Anonymous on November 29, 2016
87. ## MATH HELP

The amount of fill (weight of contents) put into a glass jar of spaghetti sauce is normally distributed with mean ì = 843 grams and standard deviation of ó = 9 grams (d) Find the mean of the x distribution. (Give your answer correct to the nearest whole

asked by TOM7 on June 19, 2013
88. ## chemistry

The first ionization potential of the elements B, C, and N (atomic numbers 5, 6, and 7) steadily increases, but that of O is less than that of N. The best interpretation of the lower value for O is that: 1. the ionization potential of N is a maximum and

asked by dave on September 15, 2010
89. ## Chemistry - Science

In an acid-base experiment at 25.0°C, a sodium hydroxide solution was standardized against KHP. The average value for the concentration of the sodium hydroxide solution was calculated to be 0.0125 M. This solution was used to titrate the phosphoric acid

asked by Anonymous on March 2, 2014
90. ## College Chemistry - Science

In an acid-base experiment at 25.0°C, a sodium hydroxide solution was standardized against KHP. The average value for the concentration of the sodium hydroxide solution was calculated to be 0.0125 M. This solution was used to titrate the phosphoric acid

asked by Anonymous on March 2, 2014
91. ## Calculus

The hemispherical tank shown is full of water. Given that water weighs 62.5 lb/ft3, find the work required to pump the water out of the tank. ---------- What is shown is just the tank (a hemisphere) with a radius of 5 ft. ---------- First I calculated the

asked by COFFEE on June 17, 2007
92. ## U.S. History (Check, Please!)

How did McCarthyism and the Red Scare change American society and government? A: While Americans were enjoying postwar prosperity and optimism, McCarthyism and the Red Scare caused society and government to fear Communism and an atomic attack. As a result,

asked by Victoria on January 24, 2016
93. ## physics

The mass of the Mars is about 0.11 the mass of the earth, its radius is 0.53 that of the earth, and the acceleration due to gravity at the earth's surface is 9.80 {\rm m}/{\rm s}^{2}.

asked by Anonymous on December 9, 2011
94. ## Physics

A body A of a mass 0.16 kg exerts a force of 6.2x10^-10 N on a body B when the distance between their centers is 0.37 meters. What is the mass of body B?

asked by JOSH on August 22, 2014
95. ## Physics

A body A of a mass 0.16 kg exerts a force of 6.2x10^-10 N on a body B when the distance between their centers is 0.37 meters. What is the mass of body B?

asked by Anonymous on November 1, 2016
96. ## Physics

A body A of a mass 0.16 kg exerts a force of 6.2x10^-10 N on a body B when the distance between their centers is 0.37 meters. What is the mass of body B?

asked by YESHA on August 22, 2014
97. ## physics

A 72 N force accelerates mass m1 by 5.0 m/s^2. The same force acts on another mass m2. What acceleration will the same force impart to the two masses when they are joined together?

asked by kyla on June 18, 2017
98. ## physics

An artificial sattelite as a mars of 600 kg and moving towards moon.calculate its kinetic energy and potential energy in mJ relative to the earth when it is 50 km from launching and moving at 2500 km/h take acceleration of earth gravitational field as 790