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

46,086 questions, page 120
1. Pre-algebra

Explain why the point-slope formula cannot be used to find the equation of a line that is parallel to y-axis?

asked by Angela on October 6, 2015
2. chemistry

Write the formula of the conjugate acid of base HCO3-,HPO2-,PO43-,SO32-

asked by baron on February 2, 2013
3. Algebra

Solve each equation using the quadratic formula. (Enter your answers as a comma-separated list.) x^2-2x+2=0

asked by Merty on April 17, 2015
4. physics is this correct

What is the radius of a real or imaginary nucleus of 46X100 do I use the formula R = R_o * A^(1/3) and therefore (1.3*10^-15)* 100^(1/3) =6.0340655e-15?

asked by james on October 22, 2015
5. Algebra

Solve each equation using the quadratic formula. (Enter your answers as a comma-separated list.) x^2 -2x +10=0

asked by Merty on April 17, 2015
6. Math

Convert $e^{-\pi i}$ to rectangular form. Not sure how to start this problem, should I use Euler's formula? Can anyone help provide the steps please? Thanks

asked by SAM on January 11, 2017
7. 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
8. algebra

what is formula to simplify the following expression to an answer with only positive exponents 4x9y-9 divided by 12x-3

asked by Jerald on August 22, 2012
9. pre calculos

A statement Sn about the positive integers is given. Write statements Sk and Sk+1, simplifying Sk+1 completely. Sn: 1 + 4 + 7 + . . . + (3n - 2) = n(3n - 1)/2 please, can you help me I need the formula how to solve it.

asked by allexelle on October 8, 2015
10. computer science

Write an application that calculates the value of e^x by using the following formula:e^x=1+(x/1!)+(x^2/2!)+(x^3/3!)... Allow the user to enter the number of terms to calculate

asked by Gina on October 7, 2010
11. CHM

In the chemical formula of ammonium sulfate, (NH4)2SO4, how many hydrogen atoms are present? 4

asked by jakey on January 27, 2013
12. algebra

Rearrange (r+s)/8s=(r-s)/8n to make r the subject. OK, I have started by rearranging the formula: 8n(r+s)=8s(r-s) 8nr+8ns=8sr-8s^2 What do I do next?

asked by Sab on August 28, 2012
13. equation on tangent of a curve need help

find the equation of a tangent of a curve at point(1,3) x^2.y^3+y^2.x^4+4x^2-14=0,i tried differentiate it n also applying this formula y=mx+b.bt i gt confuse

asked by edward on August 27, 2015
14. govt pu colllege

in term of thise energy changes mg form chloride with the formula mgcl2 not mgcl mgcl3

asked by nirmala on November 2, 2015
15. Algebra 1

find the explicit formula. 1. 0.5, -1, 2, -4 ... 2. 5, -5/3, 5/9, -5/27 ... 3. 1.25, 5, 20, 80 .... 4. -4, -24, -144, -864 ... 5. 4, 12, 36, 108 ... 6. 3, -15, 75, -375 ... 7. 2, 4, 8, 16 ... 8. 3/2, 3/4, 3/8, 3/16 ... 9. -1, -6, -36, -216 ... 10. 3, 12,

asked by Angelina on January 28, 2016
16. chemistry

A compound is found to contain 15.12 % phosphorus, 6.841 % nitrogen, and 78.03 % bromine by weight. what is the emperical formula

asked by Jeremy on June 28, 2015
17. Algebra 2

Solve this formula for r. Simplify your answer. E/d=R+t/r Make sure you use parenthesis around any polynomials in the numerator and or denominator.

asked by Nancy on April 5, 2012
18. math

Calculate the future value of S of an annuity using the following formula: S =R(1+i)^n-1/i) given R=250,i=0.001;n=13 please show the workout thankyou

asked by naomie on April 6, 2013
19. Annuity math

Calculate the future value of S of an annuity using the following formula: S =R(1+i)^n-1/i) given R=250,i=0.001;n=13 please show the workout thankyou

asked by naomie on April 6, 2013
20. math

find a formula for theta , the angle formed by the intersection of L1 & L2 let L1 and L2 be non parallel lines of slope m1 and m2. m1>m2>0

asked by arnold on March 24, 2012
21. pre-calculus

use a sum or difference formula to find the exact of the trigonometric function cos(-13pi/12)

asked by lina on April 3, 2012
22. AP Chemistry

Write a balanced chemical equation for the combustion of trioleylglycerol. molecular formula C57H110O6

asked by Timofey on January 22, 2013
23. Calculus

Verify that the volume of a cylinder of radius r and height h is given be the formula v= pi*r^2*h using cylindrical shell method.

asked by drew on March 18, 2010
24. chemistry

give the 500 compounds bond line structure and struture and name with formula as well as common name

asked by saurabh on October 8, 2012
25. Chemistry

How do I set this up? What formula do I use? Will you please help me? How many liters of ammonia at STP are produced when 10 g of hydrogen is combined with nitrogen?

asked by Jessica on March 31, 2010
26. Mathematics

Can you get an extremely high gradient of a straight line for instance: m = 14375 I used the formula (y2-y1)/(x2-x1) or have I miscalculated?

asked by James on December 5, 2015
27. accounting

I am having a difficult time figuring out the formula to compute net present value off of cash flows.

asked by Ann on February 3, 2008
28. chemistry

what are the chemical formula for sodium tetrachloroplatinate(II) and tris(ethylenediamine)cobalt(III) bromide

asked by Katie on March 30, 2012
29. algrebra

Solve by applying the quadratic Formula: all radicals should be simplified as far as possible. Show your work. a^2 -12a + 35 =0

asked by dan on April 25, 2010
30. physics

A 2000-kg car starts from rest and gains a velocity of 20 m/s in 5 /0s. What force was applied on it? What formula/s will I use?!

asked by fey on August 31, 2015
31. Chemistry.

In which of these compounds is the oxidation state of CI the highest? a) HCIO2 e) HCIO4 Answer is e Is there a formula to solve this ?

asked by Amy~ on August 29, 2010
32. calculus HS

Thanks for your help . I need to sketch the graph of f(x) = Sqrt 5-4x-x2 by completing the square. I assume I use the quadratic formula for this. But I am a little confused.

asked by kelly on September 30, 2008
33. Algebra

I don't understand this problem at all. Use the formula d=rt. Find t for r=46.6m/h and d=456.68m. Show your work.

asked by Peach on May 23, 2015
34. geometric sequences

given the geometric sequences:9 90/17, 900/289 find an explicit formula for an, where the first term is a1=9 an= a10=

asked by Rosie on April 25, 2016
35. Chem (repost)

Hydrogen and carbon dioxide react at a high temperature to give water and carbon monoxide. H2(g) + CO2(g) --> H2O(g) + CO(g) (b) Suppose 0.052 mol each of H2 and CO2 are placed in a 1.5 L container. When equilibrium is achieved at 986°C, what amounts of

asked by Rachel on April 17, 2011
36. physics

Gayle runs at a speed of 8.00 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 14.0 m. After she has descended a vertical distance of 5.00 m, her brother, who is initially at rest, hops

asked by Anonymous on October 21, 2012
37. physics

Suppose the straight-line distance between New York and San Francisco is 4.4 106 m (neglecting the curvature of the earth). A UFO is flying between these two cities at a speed of 0.69c relative to the earth. What do the voyagers aboard the UFO measure for

asked by albert on July 8, 2013
38. Physics

A Nile cruise ship takes 21.7 h to go upstream from Luxor to Aswan, a distance of 208 km, and 20.3 h to make the return trip downstream. Assuming the ship's speed relative to the water is the same in both cases, calculate the speed of the current in the

asked by Shannon on September 10, 2014
39. physics111

a river flows due south with a speed of 2.0m/s. a man steers a motorboat across the river;his velosity is 4.2m/s due east.the river is 800m wide. (A) what is his velocity(magnitude and direction)relative to the earth? (B)how much time is required to cross

asked by yonela on April 2, 2013
40. Organic chemistry

Write contributing (important) resonance structures for each of the following compounds and predict their relative C=O vibrational frequencies based on the importance of the contributing resonance structures. List in them order from highest to lowest

asked by Jane on February 17, 2009
41. art and music

Gardner and Winner (1976) identified three developmental stages in understanding art. Which of the following statements is not characteristic of adolescents? a.They have a more sophisticated understanding of art. b.One's opinions and values vary.

asked by Bev on April 14, 2019
42. Physics

A man in search of his dog drives first 13.3 mi northeast, then 17.3 mi straight south, and finally 6.85 mi in a direction 30.3° north of west. 1. a) What is the magnitude of his resultant displacement? 2. b) What is the direction of his resultant

asked by Chris on January 27, 2015
43. calc Urgent please

A boat heads 15 degrees west of north with a water speed of 3m/s. Determine its velocity relative to the ground when there is a 2m/s current from 40 degrees east of north. How long does it take to cross the river which is 800 m wide? Where does the boat

asked by Ariza on May 11, 2010
44. Geometry

A sailboat is heading directly north at a speed of 16 knots (1 knot = 0.514 m/s). The wind is blowing towards the east with a speed of 10.4 knots. (Both velocities are given relative to the Earth.) Determine the magnitude and direction of the wind velocity

asked by Ellie on February 3, 2017
45. physics

A firetruck is traveling at a velocity of +20 m/s in the x direction. As the truck passes x=63m it shoots a tennis ball backwards with a speed of 20 m/s relative to the truck at an angle of 39° from a height of 1.4 m. Neglect air resistance. At what x

asked by sandhu on November 20, 2010
46. physics

A 65kg astronaut (including spacesuit and equipment), is floating at rest a distance of 6m from the spaceship when she runs out of oxygen and fuel to power her back to the spaceship. She removes her oxygen tank (3.0 kg) and flings it away from the ship at

asked by Anonymous on October 27, 2014
47. physics

two children ride bicycle towards each other with instant velocity of 20m/s and 10m/s. Each child releases a ball 6m above the ground with forward horizontal velocity of 40m/s relative to the bicycle. if the two balls collide in above the ground. what was

asked by ridhi on May 3, 2012
48. Chemistry

Which ones of they statements our true? And which ones are false? I. Coefficients can be fractions. II. Subscripts can be fractions. III. Coefficients represent the relative masses of the reactants and/or products. IV. Changing the subscripts to balance an

asked by Rose on December 13, 2017
49. physics

A Nile cruise ship takes 21.7 h to go upstream from Luxor to Aswan, a distance of 208 km, and 19.4 h to make the return trip downstream. Assuming the ship's speed relative to the water is the same in both cases, calculate the speed of the current in the

asked by stephanie on October 4, 2007
50. Physics

A man in search of his dog drives first 13.3 mi northeast, then 17.3 mi straight south, and finally 6.85 mi in a direction 30.3° north of west. a) What is the magnitude of his resultant displacement? b) What is the direction of his resultant displacement?

asked by Stacy on January 29, 2015
51. physics

A firetruck is traveling at a velocity of +20 m/s in the x direction. As the truck passes x=63m it shoots a tennis ball backwards with a speed of 20 m/s relative to the truck at an angle of 39° from a height of 1.4 m. Neglect air resistance. At what x

asked by sandhu on November 21, 2010
52. physics

A firetruck is traveling at a velocity of +20 m/s in the x direction. As the truck passes x=63m it shoots a tennis ball backwards with a speed of 20 m/s relative to the truck at an angle of 39° from a height of 1.4 m. Neglect air resistance. At what x

asked by sandhu on November 21, 2010
53. projectiles

two children ride bicycle towards each other with instant velocity of 20m/s and 10m/s. Each child releases a ball 6m above the ground with forward horizontal velocity of 40m/s relative to the bicycle. if the two balls collide in above the ground. what was

asked by ridhi on April 29, 2012
54. college chemistry

A bag contains a mixture of copper and lead BBs. The average density of the BBs is 9.60g/cm3.Assuming that the copper and lead are pure, determine the relative amounts of each kind of BB. Express your answers numerically separated by a comma.

asked by wynneh on September 15, 2008
55. physics

A 0.40 kg mass is attached to a spring with force constant 26 N/m and released from rest at a distance of 3.2 cm from the equilibrium position Use conservation of energy to find the speed of the spring when it is halfway to the equilibrium position Find

asked by Keith on November 21, 2013
56. Science

I have two questions and I have answers for them and I don't know if there right or not. The ones that have stars by the answers is the answers I picked. 1. Complete this sentence. If volume remains the same while the mass of a substance ________, the

asked by Dan on August 22, 2017
57. Physics

You are given a four-wheeled cart of mass 11 kg, where the distance between a wheel and its nearest neighbors is 2.1 m. Suppose we load this cart with a crate of mass 109 kg, where the crate's center of mass is located in the back-middle of the cart, 0.525

asked by Christina on April 6, 2014
58. physics

You are given a four-wheeled cart of mass 11 kg, where the distance between a wheel and its nearest neighbors is 2.1 m. Suppose we load this cart with a crate of mass 109 kg, where the crate's center of mass is located in the back-middle of the cart, 0.525

asked by name on April 6, 2014
59. Physics

You are given a four-wheeled cart of mass 11 kg, where the distance between a wheel and its nearest neighbors is 2.1 m. Suppose we load this cart with a crate of mass 109 kg, where the crate's center of mass is located in the back-middle of the cart, 0.525

asked by name on April 7, 2014
60. physics

A block with a mass of 0.5kg is pushed against a horizontal spring of negligible mass and spring constant 450 N/m until the spring is compressed a distance x. When it is released, the block travels along a frictionless, horizontal surface to the bottom of

asked by natasha on March 28, 2012
61. mechanics

A string is wound around a uniform disk of radius R and mass M. The disk is released from rest when the string is vertical and its top end is tied to a fixed bar. (a) Draw a free body diagram indicating all the forces acting on the disk. (b) Calculate the

asked by sana on December 9, 2010
62. math;);)

During one term in Math 310, Min Lee took seven tests, the last of which carried twice the weight of each of the others when averages were computed. Min’s test-score vector for the term was [84,78,91,80,72,88,83]. Show that Min’s final average, a

asked by Anonymous on January 10, 2017
63. chem

quantitative determination of acetylsalicylic acid in aspirin tablets by back titration 1)why do we use a more dilute NaOH solution for the standardization of NaOH? 2)what is the rationale behind the dilution and aliquoting of the aspirin sample? 3)what

asked by krissy on January 20, 2009
64. chemistry questions

how do you distinquish between a limiting reactant and the excess reactant in a chemical reaction? b) how do you distinguish between the theoretical yield and actual yield in stoichiometric calculations and how does the value of the theoretical yield

asked by john on April 17, 2008
65. Calculus

A car is heading northwest at 80 km/h and a truck is heading east at 60km/h. Determine the velocity of the truck relative to the car.

asked by Anonymous on May 4, 2010
66. Calculus

A car is heading northwest at 80Km/h and a truck is heading east at 60 Km/h. Determine the velocity of the truck relative to the car.

asked by Bobby on May 4, 2010
67. Geometry

What is the relative position of two lines if their orthogonal projection onto the projection planes are a) parallel lines b) coinciding lines c) intersecting lines

asked by Tim on January 29, 2017
68. science

position of a particle in frame s is given by r=(6t^2-4t)i-3t^3j+3k.in another frame s',its position of the same particle is given by r'=(6t^2+2t)i-(3t^3+8t)j+3k.what is the magnitude of relative velocity of s' with respect to s if r and r'are measured in

asked by biniya on November 26, 2011
69. Physics

A sleepy man drives a car along a straight section of highway at a constant speed of 89.6 km/h. His eyes begin to close, and his car moves at an angle of 4.90° relative to the road. For how long can his attention lapse before the car begins to move across

asked by Aaron on February 2, 2012
70. Statistics

Unauthorized Downloading: A Harris Interactive survey involved 1644 people between the ages of 8 years and 18 years. The accompanying table summarizes the results. Does this table describe a relative frequency distribution? Why or why not? Downloaded

asked by Andrea on April 8, 2011
71. chemistry

1) What is the chemical formula for the compound formed between thallium(iii) and bromine? 2) What is the chemical formula for the compound formed between thallium(iii) and sulfur? HINT!: each compound wil be neutral. What is the charge of the

asked by Alex on November 7, 2013
72. Physics

A basketball player drops a 0.60-kg basketball vertically so that it is traveling at 6.0 m/s when it reaches the floor. The ball rebounds upward at a speed of 4.7 m/s. Determine the average net force that the floor exerts on the ball if the collision lasts

asked by T on June 9, 2016
73. Chem Oxidation-Reduction Titrations

In our lab, the data consists of 1. Volume of NaOCl (mL): Trial 1= 10 ml & Trial 2= 10 mL. How can we find the concentration (Molarity), what would the calculated value be? 2. Volume of H2O2 (mL): Trial 1= 1/ml & Trial 2= 1/mL. How can we find the given

asked by B on February 8, 2018
74. Physics

A hollow spherical shell with mass 2.45kg rolls without slipping down a slope that makes an angle of 30.0∘ with the horizontal. a.) find the magnitude of the acceleration of the center of mass of the spherical shell. b.) find the magnitude of the

asked by Rosae on March 12, 2015
75. Physics

A hollow spherical shell with mass 2.45kg rolls without slipping down a slope that makes an angle of 30.0∘ with the horizontal. a.) find the magnitude of the acceleration of the center of mass of the spherical shell. b.) find the magnitude of the

asked by Rosae on March 12, 2015
76. Physics

A hollow spherical shell with mass 2.45kg rolls without slipping down a slope that makes an angle of 30.0∘ with the horizontal. a.) find the magnitude of the acceleration of the center of mass of the spherical shell. b.) find the magnitude of the

asked by Rosae on March 13, 2015
77. math - probability

Imagine a LONG bike with a total of 4 wheels - 2 in the front and 2 in the back. For the bike to work at all, at least 1 front wheel and 1 back wheel must be operational. All 4 tires are the same and each, individually, has probability 'p' of failing. What

asked by andrew on November 3, 2006
78. algebra

15. Each of the following temperature ranges is in degrees Fahrenheit. Use the formula F=95 C+32 to find the corresponding temperature range in degrees Celsius (using interval notation and assume inclusion). 16.The fuel efficiency (mpg rating) for cars has

asked by Keonn'a on August 31, 2018
79. chemistry

ho do you calculate final temperature? anyone please help thanks that's a little vague. Are you dealing with ideal gases? If so you would use the formula PV=nRT P = pressure V = volume of container n = moles (grams/molar mass) R = gas constant (0.0821) T =

asked by shannon on March 15, 2007
80. Physics

A simple Atwood’s machine uses a massless pulley and two masses m1 and m2. Starting from rest, the speed of the two masses is 8.2 m/s at the end of 2.2 s. At that time, the kinetic energy of the system is 30 J and each mass has moved a distance of 9.02

asked by Jenny on November 10, 2016
81. can someone please help w/ physics?

An object of mass 154 kg moves in a smooth straight tunnel of length 2990 km dug through a chord of a planet of mass 3.19 × 10^24 kg and radius 1 × 10^7 m Find the eﬀective force constant of the harmonic motion. The value of the universal gravitational

asked by michelle on November 16, 2012
82. PHYSICS!

An object of mass 154 kg moves in a smooth straight tunnel of length 2990 km dug through a chord of a planet of mass 3.19 × 10^24 kg and radius 1 × 10^7 m Find the eﬀective force constant of the harmonic motion. The value of the universal gravitational

asked by michelle on November 16, 2012
83. Physics

The length of a spring increases by 7.2 cm from its relaxed length when a mass of 1.4 kg is hanging in equilibrium from the spring. (a) What is the spring constant? (b) How much elastic potential energy is stored in the spring? (c) A different mass is

asked by Work needed! on March 26, 2011
84. chemistry

I have 3 questions I need help with 1. mix 120ml of 0.320M silver nitrate with 40ml of 0.320M potasium chromate. What mass of silver chromate is produced? 2. Calculate the mass of white solid CaCO3 that forms when 98ml of a 0.1M Ca(NO3)2 solution is mixed

asked by Krissy on January 27, 2010
85. Chemistry

How does weight differ from mass? Weight changes with gravity while mass does not change.

asked by Dennis on January 21, 2007
86. Chemistry

At STP, 461 mL of a gas have a mass of 1.88 g. What is the molar mass of the gas?

asked by Bradley on July 13, 2011
87. chemistry

10.0mL of a pure liquid substance has a mass of 25.0 g. What is the mass of 3.00 L of the substance?

asked by Anonymous on September 26, 2011
88. Science ( the sun)

Is the sun a high mass star or a low mass star?

asked by Samantha on May 28, 2008
89. Science

What is the relationship between inertia and mass? (Is inertia higher or lower when you have more mass?)

asked by I Dont Matter on February 19, 2018
90. chemistry

A student measures the mass of a book as 12,321g. What is the book's mass in kg?

asked by Rachael on August 23, 2007
91. chemistry

At STP, 412 ml of gas have a mass of 2.60 g. What is the molar mass of gas?

asked by Peggy on March 28, 2010
92. Physics

If a mass of 1 kg is accelerated 1 m/s 2 by a force of 1 N, what would be the acceleration of a 42 kg mass acted on by a force of 42 N?

asked by Jaylen on September 20, 2018
93. chemistry

please help! how do i find the molecular mass of C3H5O2 molecular mass of 292 g.

asked by joshua on March 25, 2014
94. chemestry

the mass of CuSCN precipitate is 1.379g, what is the mass of copper in the precipitate?

asked by Help please! on September 29, 2011
95. Physics

A uniform disc of 2.98 kg is mounted so that it can rotate in the horizontal plane around a frictionless axis through its center of mass. The angular velocity of the disc at the start is 140 rpm. A hollow cylinder with thin walls and the same radius as the

asked by Bob on November 17, 2017
96. finance

I would like to enquire if you could help with the following assignment question. The exact assignment question is: Explain how an investor or analyst should analyse a company's financial statements in order to gain the maximum insight for valuation

asked by shreya on March 31, 2008
97. chemistry

case 1: Iron (3) sulphide contains 46.3% by mass of sulphur, and 53.7% by mass of Fe. case 2: Also Iron (2) sulphide contain 36.50% by mass of S and 63.50% by mass of Fe.a) Calculate the mass of sulphur which combine with 1gm of Iron in case 1 and in case

asked by solo boy on October 2, 2011
98. chemistry

A sample of one liquid has a mass of 60 grams and a volume of 50 centimeters cubed; a sample of a second liquid has a mass of 30 grams and a volume of 40 centimeters cubed. They are put in a container and mixed. Can you determine what the mass and the

asked by Ann on October 12, 2012
99. Chemistry

The mass of an empty container is 91 g. The mass of the container filled with water is 111 g. What is the volume of the container? The density of water is 1 g/cm3 .Answer in units of cm3 20cm3 016 (part 2 of 5) 1.0 points The container was emptied, dried,

asked by Katie on September 19, 2016
100. Physics

Five Boys are pushing a snowball, and each is pushing with a force of 10.0N. However, each boy is pushing in a different direction. They are pushing north, northeast, east, southeast, and south. (Each boy is pushing at an angle of 45.0 degrees relative to

asked by Sheryl on January 14, 2014