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

46,086 questions, page 291
1. ## Chemistry

A 1.1% (w/w) solution of cocaine hydrochloride (molar mass 339.81 g/mol) in water. Calculate the molal concentration. Is it 0.0297 mol/kg?

asked by Student on February 22, 2016
2. ## physics

A 0.52 kg piece of wood floats in water but is found to sink in alcohol (specific gravity = 0.79) in which it has an apparent mass of 0.040 kg. What is the SG of the wood?

asked by completely lost! on November 27, 2008
3. ## Physics

A solid ball of mass m rolls along a horizontal surface with a translational speed of v. What percent of its total kinetic energy is translational?

asked by Lacey on November 14, 2010
4. ## Chemistry

What mass of 3.0 wt% H2O2 solution is required to provide a 25% excess of reagent for the following reaction with 12 dietary iron tablets that contain ~15 mg of iron per tablet?

asked by Courtney on January 27, 2011
5. ## science

An elephant of mass 500kg stand with all four feet on the ground.Each foot has an area of 0.08m2.Calculate the pressure exerted on the ground.(g=10/s2)

asked by Doku on March 13, 2017
6. ## Physics

A sign is supported at its top right corner, point P. The sign is a square with 40 cm on each side and has 8.0 kg mass. What is the magnitude of the horizontal force that P experiences?

asked by Steve on December 6, 2010
7. ## Chemistry

Express the concentration of a 0.0860 M aqueous solution of fluoride, F–, in mass percentage and in parts per million. Assume the density of the solution is 1.00 g/mL.

asked by Heather on February 21, 2012
8. ## Physical Science

An astronaut in a spacesuit has a mass of 100 kilograms. What is the weight of this astronaut on the surface of the Moon where the strength of gravity is approximately 1/6 that of Earth?

asked by unknown on October 15, 2013
9. ## chemistry

A 2.000g sample of FeF2 times xH2o is dried in an oven. When the anhydrous salt is removed from the oven, its mass is 0.789g. What is the value of x?

asked by Danielle on September 9, 2010
10. ## Science

a block of graphite has a mass of 4.4x10 2 kg, a volume of 0.2 m3, a weight of 4.3x10 3 n, and exerts a pressure on the table of 10.7 kpa. what is the density of graphite?

11. ## Physics

A stretched string fixed at each end has a mass of 41.0 g and a length of 8.80 m. The tension in the string is 41.0 N. Nodes Antinodes b.What is the vibration frequency for this harmonic?

asked by Mary-ann on December 13, 2010
12. ## physics

A catapult used to hold a stone of mass 500g is extended by 20cm with an applied force F.If the stone leaves with a velocity of 40ms-1,the value of F is

asked by Godslight on February 21, 2012
13. ## chem

When 20.5 g of methane and 45.0 g of chlorine gas undergo a reaction that has a 75.0% yield, what mass (g) of chloromethane (CH3Cl) forms? Hydrogen chloride also forms.

asked by tiffany tai on September 18, 2012
14. ## Science

Calculate the mass of silver deposited when a current of 2.6 A ls passed through a solution of silver salt for 70 minutes. (Ag=108; 1 faraday=96 500 c)

asked by Anonymous on May 3, 2016
15. ## Chemistry

What is the mass of sodium nitrate NaNO3 that you would need to add to 250 g of water in order to prepare a solution that is 0.200 molal in NaNO3?

asked by Mike on January 30, 2014
16. ## Physics

I would say it is true that the center of mass of an isolated system moves at a constant velocity, as long as there is a constant force applied to it. Am I correct?

asked by David on December 16, 2011
17. ## physics

a body of mass 20 kg suspended from a rigid support is rotated on a cylinder of d=20cm calculate moment of force above the axis of cylinder

asked by dtehseen on November 15, 2010
18. ## SCIENCE(CHEMISTRY)

calculate the mass of silver deposited when a current of 2.6a is passed through a solution of a silver salt for 70mins ag=108,1 faraday 96500

asked by MIRACLE IWUNZE on March 14, 2015
19. ## Science

A 100 N force acting on a lever 2 m from the fulcrum balances on object0.5 m from the fulcrum on the other arm what is the weight of the object. (In newtons)? What is the mass (in kg)?

asked by Altaf on December 17, 2017
20. ## physics

A physics book of unknown mass is dropped 5.00 m. What speed does the book have just before it hits the ground? Assume that air resistance is negligible

asked by Anonymous on December 12, 2011
21. ## phy111

What is the orbital radius and speed of a synchronous satellite which orbits the earth once every 24h? Take G=6 67 10−11Nm2 kg2, Mass of the earth is 5 98 1024kg

asked by hart on October 25, 2014
22. ## Chemistry

Please check my workings to see if i'm correct, thanks! Find the percentage of nitrogen by mass in Ammonium nitrate, NH4NO3. (28/80)x 100% = 35% Is my answer correct?

asked by Marrion on October 20, 2009
23. ## physics

A ball of mass 100g fall from a height of 3m onto a horizontal surface and rebounds to a height of 2m. Calculate:(a) in momentum and (b) in kinetic energy.

asked by Princewill on August 31, 2018
24. ## phy111

What is the orbital radius and speed of a synchronous satellite which orbits the earth once every 24h? Take G=6 67 10−11Nm2 kg2, Mass of the earth is 5 98 1024kg

asked by hart on October 25, 2014
25. ## chemistry

A sample of a breathing mixture for divers contained 34.3% helium, He; 51.7% nitrogen, N2; and 14.0% oxygen, O2 (by mass). What is the density of this mixture at 22°C and 748 mmHg?

asked by caroline on October 24, 2010
26. ## Chemistry

What is the molar mass of a molecular solute when 5g of the solute dissolved in 150g of phenol lowers the freezing point 1.5C? do i have to use all three formulas to solve this one?

asked by Veronica on March 7, 2010
27. ## physics newton

During an episode of turbulence in an airplane you feel 180 N heavier than usual. Part A If your mass is 86 kg, what are the magnitude and direction of the airplane’s acceleration?

asked by silvia on March 14, 2017
28. ## Chemistry

If 0.896g of a gas occupies a 250mL flask at 20 degree celcius and 760 mmHg of pressure, what is the molar mass of the gas?

asked by TangenT on August 6, 2010
29. ## Chemistry

An alpha particle (mass = 6.6 10-24 g) emitted by radium travels at 2.5 107 ± 0.1 107 mi/h. (a) What is its de Broglie wavelength (in meters)? (b) What is the uncertainty in its position?

asked by Kate on September 5, 2010

here is another question I need help on. would this be like a mass email? Like if someone said something stupid and you in turn sent it to everyone in the organization? How is this cc: in a email used strategically in organizations to arm twist or send a

asked by april on November 1, 2008
31. ## physics

what is the mass of a Bob who fell with a force of 5N from the top of a tree if a work of 100j is done by a box through a distance of 5m calculate the weight of the box

asked by damian on May 12, 2019
32. ## physics

The system is frictionless and the trolley accelerates to the left at 3m/s squared. (a) calculate the unknown mass M. (b) calculate the magnitude of the forces in each string.

asked by kulani on March 15, 2015
33. ## Physics

A person whose mass is m = 96.0 kg steps on a mechanical bathroom scale placed on an inclined plane that makes the angle α = 15.3° with the horizontal. What is the reading on the scale?

asked by Scott on May 28, 2015
34. ## Physics

A sign is supported at its top right corner, point P. The sign is a square with 40 cm on each side and has 8.0 kg mass. What is the magnitude of the horizontal force that P experiences?

asked by Steve on December 6, 2010
35. ## Chem

Express the concentration of a 0.0700 M aqueous solution of fluoride, F-, in mass percentage and in part per million. Assume the density of the solution is 1.00 g/mL.

36. ## physics

Show that if a satellite orbits very near the surface of a planet with period T, the density (mass per unit volume) of the planet is p(rho)=3pi/(GT)^2

asked by myra on May 27, 2012
37. ## physics

a body of mass3kg and body of mass 2kg are dropped simultaneously from height of 14.9 m calculate their momenta and their kinetic energies when they are 5m above the ground

asked by DEEPI on January 5, 2018
38. ## Science

A boy of mass 50kg,climb a hii of 5m high,calculate the power use {1}when the boy used the total time of 20s.[g:10m/s]

asked by TASLIM on December 2, 2018
39. ## Physics

A spring with a spring constant of 35.0 N/m is attached to diﬀerent masses, and the system is set in motion. What is its period for a mass of 2.4 kg? Answer in units of s

asked by alice on April 1, 2013
40. ## Chemistry

2KClO3 --> 2KCl + 3O2 What mass of O2 can be made from heating 125 g of KClO3? I know that the answer is 49 g O2 but I keep getting a completely different answer, can anyone show me what I'm doing wrong? Please & Thank you

asked by Ana on March 2, 2010
41. ## physics

a body of mass 20 kg suspended from a rigid support is rotated on a cylinder of d=20cm calculate moment of force above the axis of cylinder

asked by tasneem on November 9, 2010
42. ## chimestry

if the volume of the vapor had been assumed to be 125ml instead of your measured volume,what would have been the percent error in your report? molar mass of the compound?explain

asked by soso on April 6, 2013
43. ## chemistry

what is the total mass of LiBr required to make 500.0 grams of an aqueous solution of LiBr that has a concentration of 338 ppm?

asked by Lauren on June 22, 2011
44. ## science

an elephant of mass 50kg stands with all four feet on the ground. each foot has an area of 0.2m^2calculate the pressure exerted on the ground.[g=10m/s^2]

asked by daniel on January 1, 2018
45. ## Physics

A man uses 170N of force to lift a box with a mass 4.9 kg over his head at a constant velocity. If he is 1.9m tall then what is the net work done on the box?

asked by Net Work on February 19, 2012
46. ## Physics

At liftoff, a rocket has a mass of 2x10^6 kg. It expels hot gas which provides an upthrust of 3x10^7. Find the initial accelerating of the rocket.

asked by Joey on January 26, 2011
47. ## Physics

A stone of mass 50g is accelerated from a catapult to a speed of 8.0 ms-1 from rest over a distance of 30 cm. What average force is applied by the rubber of the catapult ?

asked by Manar on January 17, 2017
48. ## Physics

A rocket weighs 539,000 N. What is a.) its mass and b.) force of thrust that must be exerted to make the rocket accelerate upward at a rate of 24 m/s^2 ?

asked by Anonymous on April 16, 2018
49. ## physics

A constant force of 58.3 N, directed at 31.7 degrees form horizontal, pulls a mass of 11.9 kg horizontally a distance of 2.77 m. Calculate the work done by the force.

asked by Lara on October 20, 2013
50. ## Physics

Two objects of mass m and 2m are travelling in opposite directions with the same speed v. The objects collide and stick together. What is the kinetic energy lost in the collision?

asked by Ramesh on May 15, 2019
51. ## calculusiii

Let S be the part of the sphere x^2 + y^2 + z^2 = 25 that lies above the plane z = 4. Let S have constant density k. (a) Find the center of mass. (b) Find the moment of inertia about the z-axis.

asked by Anonymous on April 28, 2013
52. ## Chemistry

Determine the mass of the element. What element is it? what is the molar volume of the metal in cubic centimeters(avogadro's number should be used for this problem -1cm=10^7 nm)

asked by Lauren on February 6, 2008
53. ## chemistry

Given the equation below, if 3.87×1023 particles of Sb2S3(s) are reacted with excess Fe(s), what mass of FeS(s) is produced? Sb2S3(s) + 3Fe(s)→2Sb(s) +3FeS(s)

asked by bliss on March 9, 2016
54. ## chemistry

What volume of ammonia at 7.0 atm and 235C would you get from 333g of nitrogen reactin with enough mass of hydrogen?k calculate the density of hydrogen at STP?

asked by NONO on November 18, 2011
55. ## physics

Two springs, with force constants k1=175N/m and k2=270N/m, are connected in series When a mass m=0.50kg is attached to the springs, what is the amount of stretch, x?

asked by ana on March 27, 2017
56. ## chem

determine the mass (g) of SO2 that is produced byt the reaction of 15g of CS2 according to the following equation: CS2 + 3O2 = CO2 + 2SO2

asked by jonathan on May 20, 2013
57. ## College Chemistry

how do i calculate the moles of Na2CO3 present in the original 25.00mL aliquot of carbonate solution?? the tared mass of Na2CO3 is 1.5179g

asked by Anonymous on October 2, 2012
58. ## physics

A catapult used to hold a stone of mass 500grammes is extended by 2cm with an applied force F. if the stone leaves with a velocity 40ms-1, the value of F is.

asked by emmanuel on January 19, 2017
59. ## physics

Rosie (mass 47 kg) pushes a box with a horizontal force of 140 N (31.472 lb) at a speed 15 m/min. What is Rosie's power output?

asked by Nabil on February 20, 2011
60. ## physics

Rosie (mass 47 kg) pushes a box with a horizontal force of 140 N (31.472 lb) at a speed 15 m/min. What is Rosie's power output?

asked by Nabil on February 20, 2011
61. ## chemistry

what is the total mass of LiBr required to make 500.0 grams of an aqueous solution of LiBr that has a concentration of 338 ppm?

asked by Lauren on June 22, 2011
62. ## Physics

The length of a simple pendulum is 0.58 m, the pendulum bob has a mass of 285 g, and it is released at an angle of 16 degrees to the vertical. With what frequency does it oscillate?

asked by Jessica on December 9, 2010
63. ## Physics

A spring with a spring constant of 35.0 N/m is attached to diﬀerent masses, and the system is set in motion. What is the period for a mass of 34 g? Answer in units of s

asked by alice on April 2, 2013
64. ## chemistry

If 13.5 ml of concentrated (17.0 M) of sulfuric acid was spilled on the chemistry counter, calculate the mass of sodium bicarbonate needed to neutralize the acid

asked by Kaitlyn on April 28, 2013
65. ## Chemistry

What would be the total mass of the products of a reaction in which 25 grams of table salt (sodium chloride) decomposes into the elements sodium and chlorine? Can someone please help me with this?

asked by Aylin on September 13, 2018
66. ## Chemistry

I have a bag of m&m's with 52 in it and on the pkg it states it weighs 47.9g. If I divide by 52 it gives me .92g per m&m. To find out what the mass is of a mole of m&m's do I Multiply 6.02 x 10 to the 23 power x .92g for my answer?

asked by Becky on November 9, 2007
67. ## chemistry

If 0.7825 g of solid Al and 450. mL of 0.2069 M aqueous Cl- are reacted stoichiometrically according to the equation, what mass (g) of solid Al remained? 3 CuCl2(aq) + 2 Al(s) ¨ 3 Cu + 2 AlCl3(aq)

asked by Ananth on August 25, 2012
68. ## college physics

two billiard balls of equal mass undergo a perfectly elastic collision. if the speed of one ball was initially 5.72 m/s and the other 1.64 m/s. what will their speeds be after the collision

asked by Anonymous on October 16, 2014
69. ## Chemistry

The titration of a sample of a weak acid with an equivalent weight of 108 grams requires 38.2 mL of 0.100 M NaOH. What is the sample mass in mg?

asked by Telly on November 30, 2009
70. ## physical science

The density of copper is 8.92 g/cm (cubed). If you plotted the mass of copper in grams versus the volume in cubic centimeters, what would the slope of the line be?

71. ## physics

3 objects of mass 1,0kg,1,5kgand 0,5kg respectively,are suspended by means of a thin string .how great is the tension that the string experiences?

asked by siyamthanda on February 12, 2011
72. ## Physics

an upward force of 45.0N is applied to catch a falling girl's bowling ball with a mass of 5.45kg(12lb). What is the acceleration of the ball

asked by Li Jun Heum on November 22, 2016
73. ## maths

A golf ball of mass 50g is accelerated from rest to 40m/s in 2ms - what is the average force exerted by the club on the ball?

asked by karima on January 25, 2017
74. ## science

Net force of 10 newton produces an acceleration of 2mts/sec2 in a body moving over a horizontal surface . What is the mass of the body

asked by Joseph on July 8, 2015
75. ## physics

a body is moving with a velocity of 20 meter per second is apply abrack such that it stop in 2 second mass of body is 20 kg find the forse appley by brack

asked by pankaj on September 25, 2016
76. ## College physics

a child with a mass of 40 kg slides down a vertical pole with an acceleration of 6 m/s squared. what is the magnitude and direction of the frictional force that acts on the child?

asked by Pete on February 4, 2010
77. ## Science

A lead fishing weight with a mass of 57g absorbs 146 cal of heat. If its initial temperature is 48 C, what is its final temperature?

asked by Kylie on January 26, 2015
78. ## Chemistry

The solubility Of KCLO is 33g per dm of water at 70 and 8g per dm of water at 20 calculate the mass of the solute which will crystallize out when 160g of the saturated solution is cooled from 70 to 20

asked by Joy on November 15, 2017
79. ## chemistry

An unknown diprotic acid requires 26.66 mL of 0.117 M NaOH to completely neutralize a 0.845 g sample. what is the molar mass of the acid?

asked by mathew on October 12, 2014
80. ## Chemistry

What mass of the ionic substance KBr would result in the same osmotic pressure as 34.2 g of nonionic sucrose (C12H22O11)? A little step by step walk through would help me. Thanks

asked by Joe on January 15, 2008
81. ## chemistry

In a reaction of ammonia production (NH3), 360g of nitrogen gas (N2) was reacted, generating a yield of 20%. What was the mass obtained from ammonia?

asked by wallace on November 27, 2018
82. ## physics

a ball of mass 100 g moves with a velocity of 200m/s and strikes the player comes to rest in o.o1 seconds.calculate the acceleration of the ball

asked by rocking on December 22, 2011
83. ## Science

The density of copper is 8.92 g/cm to the third power. If you plotted the mass of copper in grams versus the volume in cubic centimeters, what would the slope of the line be

asked by TJ on September 23, 2010
84. ## Physics

A piano string having a mass per unit length equal to 5.00 „e 10¡V3 kg/m is under a tension of 1 350 N. Find the speed with which a wave travels on this string.

asked by Cf on December 7, 2010
85. ## chemistry........help!! =)

One brand of laundry bleach is an aqueous solution containing 4.00% sodium hypochlorite (NaOCl) by mass What is the molarity of this solution? (Assume a density of 1.02 g/mL .)

asked by Lisa, Help needed! on December 8, 2010
86. ## chemical calculations

A brick of silver with a mass of 31.5 kg measures 0.150 m long, 42.0 cm wide, and 72.00 mm thick. What is density of silver in grams per cubic centimeter?

asked by Michael G on February 2, 2014
87. ## physics

a 5kg bomb exploded into two fragments. if one fragment with 3kg moves in a direction with 5m/s then what is the velocity of the send fragment of mass 2kg?

asked by Lakshmanarayana on September 12, 2016
88. ## Hon. Chemestry

The rock in a lead ore deposit contains 84% PbS by mass. How many kilograms of the rock must be processed to obtain 1.0 kg of Pb? I have no idea how to start or how I'm converting. Please help...

asked by Sarahi on October 28, 2014
89. ## space

What is the value of g for space-shuttle territory , about 200km above the Earth's surface. Data: Earth's mass is 6x10^24kg, and radius is 6380 km

asked by hov on September 12, 2010
90. ## science

if a body of a mass 4kg is acted upon at constant force of 12n at 2sec,calculate the kenetic energy gain by the body.

asked by MUSA AUDU on March 31, 2017
91. ## Physics

A small fly of mass 0.25 g is caught in a spider’s web. The web vibrates predominately with a frequency of 5 Hz. Find the value of the spring constant.

asked by Anonymous on August 4, 2015
92. ## Physics

In a vertical lifting an object with mass of 2kg is lifted 1m above the ground. A work of 80J is done with a constant force. What is the acceleration of the object?

asked by Anonymous on November 21, 2016
93. ## Physics

A Boeing 747 has a mass of 400,000kg and a takeoff speed of 100m/s . It cruises at a height of 10,000m at a speed of 255m/s

94. ## physics

A team of sled rides has a mass of 180 kg. If they have 8,000 J of kinetic energy at the bottom of the hill, how tall was the hill they just tackled?

asked by Natalie on November 4, 2014
95. ## Crown poly

0.012moldm^3 of H2SO4 was prepared in 2 litre of volumetric glass.calcute (a)mass concentration. b.moles of H2SO4 used. C.density of solution

asked by Jummy on April 11, 2013
96. ## Chemistry

No change of mass was observed when a definite amount of a mixture of KI and NaCl is converted to sulphate salts. What is the percentage composition of the mixture?

asked by Anamika on February 23, 2016
97. ## Chemistry

Calculate the mass of solid neded to make 500ml of solution that is 0.25m in sulfate ion, using sodium sulfate decahydrate.

asked by Emily on October 28, 2011
98. ## Physics-10

Two identical gliders slide toward each other on an air track. One moves at 1m/s and the other at 2m/s. they collide and stick. the combined mass moves at A. 1.5m/s B. 1/3m/s C. 1/6m/s D. 3/4m/s E. 1/2m/s which of this options is the right answer?

asked by Stanley on March 4, 2011
99. ## Chemistry

Suppose 500 ml of a .0035 M solution of lead nitrate is reacted with sulfuric acid. What mass of lead sulfate should precipitate?

asked by Anonymous on March 28, 2012
100. ## Physics

An elevator (mass 4175 kg) is to be designed so that the maximum acceleration is 0.0700g. What is the maximum force the motor should exert on the supporting cable?

asked by Jake on February 1, 2012