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

46,086 questions, page 283
1. ## physics

The mass of a solid cube is 1200 g, and each edge has a length of 4.15 cm. Find the density of the cube. Answer in units of kg/m^3

asked by Sid on August 25, 2013
2. ## Chemistry

A gas weighing 23.6 g occupies a 10.0 L flask at 27 C and 780. torr of pressure. Calculate the molar mass of the gas.

asked by Ron on November 23, 2015
3. ## Chemistry

When the following reaction took place at 23.8 and a pressure of 758 torr, 3.9 L of o2 were collected. What mass of KCIO3 decomposed? KCIO3->KCI+O2

asked by Sara on July 20, 2013
4. ## Physics

A rocket blasts off from rest and attains a speed of 42.3 m/s in 13.8 s. An astronaut has a mass of 70.2 kg. What is the astronaut's apparent weight during takeoff?

asked by Jess on October 24, 2015
5. ## chemistry

An alpha particle (mass = 6.6 × 10-24 g) emitted by radium travels at 3.4 × 107± 0.1 × 107 mi/h. What is its de Broglie wavelength (in meters)?

asked by brittany on March 25, 2010
6. ## physics

If a proton were traveling the same speed as electrons in a TV picture tube (about 7.2 107 m/s), what would its de Broglie wavelength be? The mass of a proton is 1.67 10-27 kg.

asked by Anonymous on April 22, 2014
7. ## Chemistry

Determine the mass of each reactant needed to give 1.5 mol of HNO3 NO2(g)+H2O(l)---> HNO2(aq)+HNO3(aq)

asked by Sandy on October 7, 2009
8. ## science

your mass is 90 kilograms. you are on the earth where the acceleration of gravity is measured at 9.8 meters/sec sec. What is your weight in Newton?

asked by Ann on April 2, 2011
9. ## physics

A 1.92 kg cart and a 3.7 kg cart both slide toward each other at 1.34 m/s on an air track. They collide and stick. The combined mass moves at what speed in m/s

asked by Anonymous on February 6, 2012
10. ## science

If 19:3 of iron ore (Fe2O3) reacts completely with carbon monoxide . Calculate the mass of iron Fe that is formed

asked by banele on November 16, 2014
11. ## physics

A Piece of string 5.3-m long has a mass of 15.o g what must the tension in the string be to make the wavelength of a 125- Hz wave 120.0 cm

asked by Anonymous on May 4, 2012
12. ## Chemistry

What is the mass in grams of copper chloride dihydrate (CuCl2·2H2O) required to prepare 80.0 mL of a 0.10 M CuCl2 solution?

asked by John on October 20, 2018
13. ## chemistry

If 0.385 g of gas occupies a volume of 200 mL at -73 oC and 750 torr, what is the molecular mass of the gas? a) 21.4 b) 32.0 c) 44.0 d) 48.0 Someone can help me this answer please..?

asked by Susie on April 18, 2010
14. ## Chemistry

How many grams of NaC2H3O2 (M=82.034 g mol-1) should be dissolved in 400 g of water to prepare a solution which is 11.28% NaC2H3O2 by mass?

asked by Chris on February 12, 2009
15. ## physics

Suppose that a sled is accelerating at a rate of 2 m/s2. If the net force is tripled and the mass is doubled, then what is the new acceleration of the sled?

asked by Chelsey Achord on December 3, 2012
16. ## Chemistry

What mass of lithium phosphate is needed to prepare 500.0 mL of a solution having a lithium ion concentration of 0.1385 M?

asked by Chris on April 14, 2014
17. ## physics

A force of 1.35 newtons is required to accelerate a book by 1.5 meters/second2 along a frictionless surface. What is the mass of the book?

asked by nimitz on February 1, 2013
18. ## physics

An elastic cord vibrates with a frequency of 3.5Hz when a mass of 0.62kg is hung from it.What is its frequency if only 0.40kg hangs from it?

asked by Daniela on November 26, 2013
19. ## Physics

A 9500 kg boxcar traveling at 19 m/s strikes a stationary second car. The two stick together and move off with a speed of 10 m/s. What is the mass of the second car?

asked by Davey on February 1, 2012
20. ## chemistry

Calculate the mass of Mg metal requied to consume 2560g of CO2 in the reaction 2Mg+CO2 → 2MgO + C

asked by Anonymous on August 18, 2017
21. ## science

An automobile is pulled by a horizontal tow line, with a force of 900 N. If its acceleration is 1.0 m/s2, calculate the mass of the automobile.

asked by tash on January 30, 2013
22. ## chemistry II

If a 2.15-g sample of gas occupies 750. mL at STP, what is the molar mass of the gas at 125 degrees celcuis

asked by kris on February 3, 2011
23. ## Chemistry

2Na+F2=2NaF if 20.0 g of sodium is used what mass of sodium fluoride could be produced assuming that fluorine gas is unlimited

asked by megan on May 1, 2012
24. ## science

guyz got a hard question... A net force of 10N to a 5 kg mass. bY HOW MUCH does a body accelerate.. Given: F=10N;m=5kg

asked by Loraine Ordono on December 5, 2011
25. ## physical science

what is transferred by a force moving an object through a distance? a. force b. mass c. motion* d. energy please check my answer

asked by a'ny on February 23, 2018
26. ## Chemistry

Calculate the mass in grams for a gold sample that absorbs 245J to change its temperature from 19 degrees to 49 degrees

asked by Wendy on March 5, 2011
27. ## Chemistry

What is the mass if solute dissolved in the indicated volume of each of the following solutions? (b) 4.25 L of 0.450 M KIO4g (c) 60.0 mL of 0.310 M ZnSO4g (d) 60.0 mL of 0.310 M Ni(NO3)2g

asked by Harry on March 26, 2014
28. ## chemistry II

If a 2.15-g sample of gas occupies 750. mL at STP, what is the molar mass of the gas at 125 degrees celcuis

asked by kris on February 3, 2011
29. ## Physics

A rocket blasts off from rest and attains a speed of 53.8 m/s in 17.4 s. An astronaut has a mass of 67.2 kg. What is the astronaut's apparent weight during takeoff?

asked by Hannah on October 22, 2015
30. ## science

a car of mass 900 kg moves at 10 m/s. what is the braking force required to stop the car in a time of 5 seconds?

asked by anonymous on June 29, 2009
31. ## physics

How long would our year be if our Sun were two fifths its present mass and the radius of the Earth’s orbit were six times its present value?

asked by erin on May 6, 2010
32. ## welkin

a block of mass 50kg just slide distance of one metre if the coefficient of friction between their surface is 0.2,then work done against friction is

asked by iqbal on September 29, 2015
33. ## Physicis

A mass of gas occupies 20cm at5c and 760mmhg pressure what is its volume at30c and800mmhg pressure .

asked by Chidera on April 23, 2016
34. ## Chem II

What mass of PbI2 can be formed from 75.0 mL of 0.65 M NaI by adding excess Pb(NO3)2? Pb(NO3)2 + 2NaI ---> PbI + 2NaNO3

asked by Ken on February 5, 2008
35. ## chemistry

Calculate the mass of ethanol required to heat 200mL of water from 21 degrees celcius to 45 degress celcius

asked by Kate on November 9, 2010
36. ## physics

A rocket blasts off from rest and attains a speed of 59.4 m/s in 14.1 s. An astronaut has a mass of 66.7 kg. What is the astronaut's apparent weight during takeoff?

asked by S on September 28, 2014
37. ## physical science

The force of gravity acting on a body is 675 newtons. find the mass of the body to the nearest kilograms.

asked by Anonymous on May 20, 2015
38. ## chemistry

A 100.0 ml aqeuous solution that contains 0.50 g of hemoglobin has an osmotic pressure of 0.00178 atm. What is the molar mass of hemoglobin?

asked by victoria on February 16, 2015
39. ## Ap Chemistry.

Zn + 2HCl -> ZnCl2 + H2 If 7.29 g of Zinc reacted, how many liters of HCl were used? I know that i can't use mass volume conversion, because the HCl is not a gas...so what do i do?

asked by Chris on October 25, 2010
40. ## Chemistry

6.00 g of hemoglobin was dissolved in 250.0 mL of solution. The resulting osmotic pressure was 6.80 mmHg at 23.0C. what is the molar mass of hemoglobin?

asked by libby on June 10, 2018
41. ## chemistry

a 1.00*10^1 mL sample of an unknown liquid has a mass of 7.99 g. Calculate the density of the liquid using the proper number significant figures

asked by mike on January 28, 2015
42. ## chemistry

What mass of hydrogen peroxide should result when 1.50g of barium peroxide is reacted with 25.0mL of 0.50 M hydrochloric acid?

asked by confused on December 13, 2011
43. ## chem 1046

Calculate the boiling point a. 10.5 g FeCl3 in 2.11 102 g water b.4.6% KCl by mass (in water) c.0.140 m MgF2

asked by Anonymous on July 6, 2012
44. ## Chemistry

Find the mass of urea (CH4N2O) needed to prepare 50.9 g of a solution in water in which the mole fraction of urea is 7.69×10−2.

asked by Nicole on February 24, 2016
45. ## chem

A block of metal has a width of 3.2cm, a length of 17.1cm, and height of 3.6 cm. Its mass is 1.3 kg. Calculate the density of the metal.

asked by jake on September 7, 2011
46. ## chemistry

A scientist collects a sample of carbon dioxide that contains 1.5 x 1025 molecules of CO2. In grams, what is the mass of the sample?

asked by Antonio on December 20, 2011
47. ## Chemistry 101

A gaseous compound has a density of 0.355 g/L at 17 degree celcius and 189 mmHg. What is the molar mass of the compound?

asked by Eunice on April 30, 2009
48. ## chemistry

Determine the mass of hydrogen gas if 36g of water undergoes electrolysis to produce hydrogen and oxygen.

asked by Duhe on March 1, 2010
49. ## chemistry

Determine the mass of hydrogen gas if 36g of water undergoes electrolysis to produce hydrogen and oxygen.

asked by Duhe on March 1, 2010
50. ## chemistry

Determine the mass of hydrogen gas if 36g of water undergoes electrolysis to produce hydrogen and oxygen.

asked by Duhe on March 1, 2010
51. ## Physics problem.. :/

A 8.7 kg block is on a frictionless surface. It is connected by a string over a pulley to a 8.6 kg hanging mass. Find the acceleration of the block. ?

asked by Kat on November 17, 2011
52. ## Chemistry

15.0 mL of 0.30 M sodium phosphate solution reacts with 20.0 mL of 0.23M lead(II) nitrate solution. What mass of precipitate will form?

asked by Andy on September 28, 2014
53. ## physics

A moving object has a kinetic energy of 133 J and a momentum with magnitude of 39.8 kg·m/s. Detemine the mass (kg), and velocity (m/s) of the object.

asked by justin on May 19, 2011
54. ## chems

A cubic piece of metal measures 7.50cm on each edge. If the metal is nickel, whose density is 8.90 {\rm g/cm}^3, what is the mass of the cube?

asked by jason on September 3, 2012
55. ## Physics

A crate has a mass of 27 kg. What applied force is required to produce an acceleration of 3 m/s2 if the frictional force is known to be 98 N? I am confused on how to solve this.

asked by Anonymous on September 3, 2012
56. ## Chemistry

A piece of metal with a mass of 131 g is placed in a 50 mL graduated cylinder. The water level rises from 20. mL to 35 mL. What is the density of the metal?

asked by Lean brow on September 5, 2016
57. ## Physics

A constant force of 35.9 N, directed at 28.7o from horizontal, pulls a mass of 14.7 kg horizontally a distance of 3.41 m. Calculate the work done by the force.

asked by Kristen on October 20, 2013
58. ## Physics

A constant force of 35.9 N, directed at 28.7o from horizontal, pulls a mass of 14.7 kg horizontally a distance of 3.41 m. Calculate the work done by the force.

asked by Kristen on October 20, 2013
59. ## sdfghj

a certain force acting on a body of mass 2 kg increases it's velocity from 6m/s to 15m/s in 2 seconds . the work done by the force during this interval is ?

asked by bh on November 11, 2011
60. ## Chemistry

The compound A1B2 (molar mass = 132) has a solubility of 13 g/L. Calculate the Ksp for this compound. I'm stuck on this question, please help?

61. ## Chemistry

The density of oak lumber is approximately 800km/m^3. What is the mass in grams of 4 cubic meters of oak? And the work.

asked by Maryanne on September 30, 2010
62. ## physical science

a car of mass 900 kg move at 10 m/s. What is the braking force required to stop the car in a time of 5 seconds?

asked by jake on February 11, 2008
63. ## physics

A rocket blasts off from rest and attains a speed of 58.9 m/s in 14.4 s. An astronaut has a mass of 57.5 kg. What is the astronaut's apparent weight during takeoff?

64. ## chemistry

Find the mass of barium metal (in grams) that must react with O2 to produce enough barium oxide to prepare 1.1 L of a 0.10 M solution of OH^ -.

asked by Jessica on February 19, 2011
65. ## Chemistry

If the density of carbon is 3.51 g/cm3, and you have a small diamond (pure carbon) that has a mass of 0.0270 grams, what is the volume?

asked by Courtney on September 4, 2016
66. ## physics

An automobile that has a mass of 1.3 x 103 Kg, has 3.9 x 105 J of kinetic energy when it has speed of 24.6 m s-1 (88.6 km h-1). What height should you lift the car to have this energy?

asked by Sammie on January 17, 2017
67. ## Physical Science

How much work is needed to lift an object with a mass of 51.0 kg to a height of 2.00 meters?  Calculate your answer in Joules Answer

asked by Anonymous on February 26, 2012
68. ## physics

A small plane starts down the runway with acceleration 7.4 .if the force provided by its engine is 1.5×104 , what is the plane's mass?

asked by Anonymous on June 25, 2011
69. ## Chemistry

Calculate the mass ( g ) of the solute acetonitrile and the volume ( L ) of the solvent C6H6 that should be mixed to produce 4.72 kg of a solution that is 1.34 m acetonitrile.

asked by Tylor on May 4, 2009
70. ## chemistry

What is the density of CH4 gas at 32.7 degree celsius and 109kPa? The molar mass of CH4 is 16.042g/mol.

asked by jin on February 24, 2014
71. ## physics

A ball of mass 0.50 kg is thrown vertically upwards, calculate the net force on the ball at the top of its flight

asked by Duy on March 20, 2016
72. ## Physics

A body of mass 100kg is released from a height of 200m .with what energy does the body strikes the ground (take g=10m/s)

asked by Ola on November 13, 2018
73. ## chemistry

How many grams of NaOH are contained in 5.0 × 102 mL of a 0.77 M sodium hydroxide solution? The molar mass of NaOH is 40.0 g/mol.

asked by Dystinee on October 15, 2014
74. ## chem

How many grams of CaCl2 (molar mass = 111.0 g/mol) are needed to prepare 4.44 L of 0.500 M CaCl2 solution?

asked by jann on May 15, 2011
75. ## chem

At normal temperature and pressure, air has a density of 0.001184 g/mL. What is the mass of air in a room that is 3.71 m by 3.60 m by 2.51 m? Answer in units of kg

asked by holy on August 28, 2012
76. ## physics

A 9600 kg boxcar traveling at 15 m/s strikes a stationary second car. The two stick together and move off with a speed of 7.0 m/s. What is the mass of the second car?

asked by Anonymous on March 7, 2010
77. ## Science

A body of mass 10kg is acted upon by a constant force 20N for 3secs. Calculate the K.E gained by the body.

asked by Chinyere on May 2, 2016
78. ## science

okay can someone explain what conservation of mass is to me? my teacher told us but wasn't clear. i had a test with it in today so i want to know so i can tell my teacher i do understand it now.

asked by minka on February 26, 2010
79. ## physics

discuss the relationship of the following variables with the centripetal force: a.)radius of revolution b.)mass of the object c.)speed of revolution.

asked by zianna on September 18, 2012
80. ## chemistry

A solution of sulfuric acid in water that is 25% H2SO4 by mass has a density of 1178 g/ml. Which expression gives the molarity of this solution?

asked by help on November 16, 2011
81. ## Chem

The molar weight of MgSO4 is 120.366gmol-1. What is the mass/volume percentage of a 2.5M water solution of MgSO4?

asked by James on May 27, 2013
82. ## Physics

A block on a spring moves in SHM with amplitude 0.23 m and period 3.8 s. The mass of the block is 2.1 kg. What is the total energy of the system?

asked by Jamie on June 24, 2012
83. ## chemistry

An alpha particle has a mass of 6.6*10-24 g travels at 3.4*107 +/- 0.1*107 mi/h a. What is the DeBroglie wavelength (in meters)? b. What is the uncertainty in position?

asked by Brittany on December 2, 2009
84. ## physics

If the mass of a cart full of groceries decreases to half and, at the same time, its speed doubles, the momentum of the cart?

asked by Anonymous on November 5, 2010
85. ## Chemistry

What volume (mL) of the solvent benzene should be added to 142 mL of the solute CH3CN to generate a solution that is 2.68% by mass CH3CN?

asked by Scott on September 2, 2008
86. ## Physics

Which exerts more gravitational force on the baby, Mars or the obstetrician, given that Mars has a mass of 6.4 1023 kg and is 8. 1010 m from Earth?

asked by George on April 10, 2013
87. ## Physics

A firefighter with a mass of 52 kg slides down a vertical pole with an acceleration of 3 m/s/s . The acceleration of gravity is 10 m/s/s. What is the friction force that is acting on him

asked by Davis on October 30, 2014
88. ## Science

A hydrochloric acid solution consist of 28.0% HCl, by mass, and has a density of 1.14 g/mL. What volume of this solution is required to react with 1.35 g Al?

asked by Vishea on June 22, 2018
89. ## chemistry

Give the number of chloride ions in 11.1g of calcium chloride.(Mr=molar mass) n=m/Mr=11.1/110.98=0.100moles of CaCl2 Please help!

asked by Anonymous on September 10, 2008
90. ## Chemistry

the freezing point of a water solution containing 26.1g of a non electrolyte in 538g of water is 0.73°C. what is the molar mass of the solute Thank you in advance

asked by Mika Reyes on March 20, 2017
91. ## Chemistry

Given that KH for CO gas at 25 OC is 9.71 x10-4 mol.L-1.atm-1. Calculate the mass of CO that would dissolve in 1.00 L of H2O if the partial pressure of CO is 1.38 atm.

asked by Chelsea on February 15, 2011
92. ## Physics

Planet Jupiter revolves around the Sunin 12 years (3.79 X 10^8 sec. What is its mean distance from center of Sun? mass of sun is 1.99 x 10^30 kg.

asked by Christine on June 17, 2012

An uknown substance from planet x has a density of 10g/ml.it occupies a volume of 80ml. what is the mass of this unknown substance

asked by gasharee on September 27, 2010

An uknown substance from planet x has a density of 10g/ml.it occupies a volume of 80ml. what is the mass of this unknown substance

asked by gasharee on September 27, 2010
95. ## chemistry

A mixture of 16 g of salt and 47 g of baking soda is poured into 296 ml of water. What is the total mass of the mixture in grams?

asked by Vivian on June 14, 2012
96. ## chemistry

Calculate the mass of HCl required to prepare 2.5 liters of a 0.08 molar solution of HCl. H 1.01 Hydrogen 17 Cl 35.45 Chlorine

asked by archie on September 26, 2011
97. ## physics

a girl of mass 40 kg is skating at a constant speed of 1 m/s. supposed she doubles her speed, what will be the change in her kinetic energy?

asked by Anonymous on January 25, 2011
98. ## Physics

A hamster is pushed off a cliff by wind. Its mass is 0.040 kg and has a Potential Energy of 98 J. Find the kinetic energy...

asked by Anonymous on November 11, 2016
99. ## Physics

A hamster is pushed off a cliff by wind. Its mass is 0.040 kg and has a Potential Energy of 98 J. Find the kinetic energy.

asked by Bob on November 11, 2016
100. ## chemistry

Calculate the molar mass of a non-electrolyte that lowers the freezing point of 25.0 g of water to - 3.9 oC when 4.27 g of the substance is dissolved in the water.

asked by Danica on October 1, 2012