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April 17, 2014

Search: PH3

Number of results: 73

Chemistry
Put the following in order in terms of increasing melting point: SiH4, SiO2, CH4, NH3, PH3. Lowest → Highest (A) NH3, PH3, CH4, SiH4, SiO2 (B) SiO2, PH3, NH3, CH4, SiH4 (C) SiH4, CH4, NH3, PH3, SiO2 (D) CH4, SiH4, PH3, NH3, SiO2 (E) CH4, SiH4, SiO2, NH3, PH3
Wednesday, February 10, 2010 at 1:52am by LeePyeonggang

Chemistry
All contain H atoms. The difference is that H has an oxidation state of +1 in H2S (the usual number for hydrogen but it is -1 in SiH4 and PH3. You can find some sources that give H a -1 in PH3 and some that give it a +1 in PH3. Since this question is stated as it is I assume ...
Thursday, November 1, 2012 at 1:00am by DrBob222

chemistry
what is the maximum number of grams of PH3 that can be formed when 6.2 g of phosphorus reacts with 4.0 g of hydrogen to form PH3
Sunday, March 21, 2010 at 8:03pm by jose

chemistry
I think you mean 4P not P4 4P(S) +3NaOH(aq) +3H2O(I) 3NaH2PO4(aq) +PH3(g) You need 4 P atoms on the left for every PH3 molecule on the right atomic mass of P = 31 molecular mass of PH3 = 31+3 = 34 so every gram of PH3 has (31/34) grams of P but we need 4 times that much to ...
Sunday, June 19, 2011 at 3:16pm by Damon

chemistry
Convert grams of phosphorus to moles of P4. Do likewise for grams of hydrogen, H2. To convert grams to moles you divide grams by the formula mass of that substance. The mole ratio of H2 reacting with P4 is 6/1. If the number of moles of H2 is 6 times (or greater) the moles of ...
Tuesday, June 10, 2008 at 8:36pm by GK

chemistry
what is the maximum number of grams of PH3 that can be formed when 6.2grams of phosphorus reacts with 4.0 grams of hydrogen to form PH3? P4+6H2--> 4PH3
Monday, June 9, 2008 at 10:12am by afdsfd

chemistry
calculate the mass of phosphorus required to make 200g of phosphine ,PH3 by the reaction: P4(S) +3NaOH(aq) +3H2O(I) 3NaH2PO4(aq) +PH3(g)
Sunday, June 19, 2011 at 3:16pm by ceasar

chemistry
I presume you mean phosphorus? This is a tricky equation as you need to know that the products are NaH2PO2 and PH3 can you balance it from here? NaOH + P -> NaH2PO2 + PH3
Monday, August 22, 2011 at 3:54am by Dr Russ

chemistry
What is the maximum number of grams of PH3 that can be formed when 6.2 grams of phosphorus reacts with 4.0 grams of hydrogen to form PH3? P4+6H2-->4PH3. how do i do this question
Tuesday, June 10, 2008 at 8:36pm by Miley

AP CHEMISTRY
Kc=[PH3][BCl3] since those are both equal concentratons, then x^2=Kc x= sqrt Kc b. mass of PH3+massBCl3=2xVolume=2*.450*sqrtKc
Monday, February 6, 2012 at 7:12pm by bobpursley

chemistry
Okay first lets figure out the equation P+H2---->PH3 balance it now we have: 2P + 3H2 --->2PH3 equation is now balanced. let us now find the reactant in excess 2 moles of P= 3 moles of H2 2(31)g of P = 3(2)g of H2 6.2 g of P= x x= 6.2x6/62= 0.6 g of H2 4 grams of H2 are ...
Sunday, March 21, 2010 at 8:03pm by Mohamed

chemistry
PH3 has a mass of 17.33 grams, what is the mass in grams of H2 produced? 4 PH3 -> P4 + 6 H2
Monday, December 6, 2010 at 10:50pm by jamie

chemistry
Write and balance the equation. Convert grams P4 to mols. mols = grams/molar mass. Use the coefficients in the balanced equation to convert mols P4 to mols PH3. Convert mols PH3 to g PH3. g = mols x molar mass.
Friday, May 10, 2013 at 10:27am by DrBob222

chemistry
You know what zero order is; that means the rate doesn't depend upon the concn. However, SOME of it must be present, that is, the concn of PH3 obviously can't be zero. Also, it doesn't much matter how much is present. In this case, however, you can look at the equation and see...
Sunday, March 25, 2012 at 2:29pm by DrBob222

chemistry
Many reaction involving heterogeneous catalysts are zeroth order, that is rate=k. An example is the decomposition of phosphine (PH3) over tungsten (w): 4Ph3---> P4 + 6H2 It is found That the reaction is independent of PH3. As lon 1 g as phosphine's pressure is sufficiently ...
Sunday, March 25, 2012 at 2:29pm by court

CHEMISTRY
Consider the reaction shown below. 4 PH3(g) P4(g) + 6 H2(g) If, in a certain experiment, over a specific time period, 0.0061 mol PH3 is consumed in a 1.9-L container each second of reaction, what are the rates of production of P4 and H2 in this experiment?
Sunday, February 27, 2011 at 2:41pm by Mattie

Science
8. The balanced equation P4 (s) + 6H2 (g) --> 4PH3 tells us that 2 mol H2 a. reacts with 1 mol 4 b. produces 4 mol PH3 c. cannot react with phosphorus d. produces 2 mol PH3 e. reacts with 2 mol P4 idk y i cant seem to get the answer from the choices above?
Tuesday, January 18, 2011 at 6:13pm by Dylan

Chemistry
since PH3 has a higher molar mass, it would be expected that it would have a higher BP than NH3, but that's not the case because of hydrogen bonding in NH3 and not in PH3. it occurs when H+ is attracted to lone pairs of atoms like N, O, F in another molecules. other molecules ...
Saturday, March 12, 2011 at 1:13am by gin

Chemistry e
Thank you very much! I tried answering this one but I am getting answers that are not in the 4 choices given...Help? 8. The balanced equation P4 (s) + 6H2 (g) --> 4PH3 tells us that 2 mol H2 a. reacts with 1 mol 4 b. produces 4 mol PH3 c. cannot react with phosphorus d. ...
Tuesday, January 18, 2011 at 6:05pm by Kaye

chemistry
For each pair of substances listed below, identify the one with the lower boiling point. (a) Silane (SiH4) and Phosphine (PH3) answer = silane (b) Ammonia (NH3) and Phosphine (PH3) answer = phosphine (c) Lithium fluoride (LiF) and Hydrogen Fluoride (HF) answer = HF
Friday, May 31, 2013 at 1:47am by barco

AP CHEMISTRY
At 80.C, Kc = 1.87 10-3 for the reaction. PH3BCl3(s) PH3(g) + BCl3(g) (a) Calculate the equilibrium concentrations of PH3 and BCl3 if a solid sample of PH3BCl3 is placed in a closed vessel at 80.C and decomposes until equilibrium is reached. (b) If the flask has a volume of ...
Monday, February 6, 2012 at 7:12pm by Stan3000

chemistry
enthalpy change^H is +23kJ mol-1 of phosphine (PH3) for the reaction 2P(s)red+3H2(g)---->2PH3(g) a) Calc. entropy change for this reaction. Explain how this information allows you to determine the spontaneity or non-spontaneity of this reaction at any temp (S for PH3 is ...
Tuesday, February 12, 2013 at 10:06pm by harry

AP CHEM
Kc = 1.87 10-3 for the following reaction. PH3BCl3(s)=>PH3(g) + BCl3(g) (a) Calculate the equilibrium concentrations of PH3 and BCl3 if a solid sample of PH3BCl3 is placed in a closed vessel and decomposes until equilibrium is reached. (b) If the flask has a volume of 0.400...
Saturday, February 7, 2009 at 12:13am by Ashley

chemistry
Which of the following substances can act as a Bronsted acid in aqueous solution? (Select all that apply.) C3H8 NH41+ HCl H2 H2O H2CO3 PH3 Which of the following substances can act as a Bronsted base in aqueous solution? (Select all that apply.) PH3 PH41+ CO32- SO42- H2 CH4 NH3
Tuesday, April 27, 2010 at 5:27pm by Sue

chemistry
Add up the numbers to get the molar mass of phosphine, PH3 = 33.998 g/mol molar mass of hydrogen, H2 = 2.0159 4 mol of PH3 yields 6 mol H2 Mass of Hydrogen = 17.33*(6*2.0159)/(4*33.998) = 1.541 g Check my calculations.
Monday, December 6, 2010 at 10:50pm by MathMate

chemistry
Ptotal = PHe + PO2. Solve for PH3.
Sunday, December 12, 2010 at 9:57pm by DrBob222

11th grade
What is the balanced chemical equation for P+H2>PH3?
Thursday, December 3, 2009 at 1:18pm by Butt

science
Balance in acid solution PH3+ I2-> H3PO4+ I-
Monday, September 6, 2010 at 9:32pm by Joseph

Chemistry
What mass of phosphine gas yields 3.5x10^-6 moles of PH3
Tuesday, November 9, 2010 at 4:58pm by Cathy

chemistry
The total number of atoms in 0.111 mol of FeCO3(PH3)2...?
Monday, October 3, 2011 at 6:40pm by Linda

chemistry
HOW MANY LITERS OF H2 must react to produce 75.0g of PH3
Sunday, April 3, 2011 at 9:27am by jane

chemistry
Write the expression for Kc and Kp for the reaction PH3BCl3(s) <==> PH3(g) + BCl3(g)
Thursday, March 8, 2012 at 3:45pm by Lindsay

chemistry
This is a limiting reagent problem. How do I know that? Because BOTH reactants are given. 1. Write the equation and balance it. 2. Convert 15.0 g PH3 to moles. moles = grams/molar mass. 3. Convert 8.0 L oxygen at the conditions listed to moles using PV = nRT. 4. Using the ...
Monday, November 22, 2010 at 6:40pm by DrBob222

chem
would you expect the nonbonding electron pair domain in nh3 to be greater or less in size than for the corresponding one in PH3?
Thursday, June 28, 2012 at 12:12am by skye

chem
Take your pick. http://www.google.com/search?q=bond+angles+NH3+and+PH3&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
Thursday, June 28, 2012 at 12:12am by DrBob222

Chemistry
Are these shapes correct?PH3-trigonal pyramidal, CHCl3-tetrahedral, H2S-linear and PO4^-3-tetrahedral?
Wednesday, December 7, 2011 at 10:42am by Lisa

chemistry
identify and show the bond in the formation of the following; AsH3 BaO BCL3 SO2 ZnC2 CL2 K2S PH3 PLS I NEED AN ANSWER THANKS
Sunday, June 19, 2011 at 11:15pm by joyce

Chemistry
If the standard enthalpy of formation of PH3(g) is +5.4 kJ mol-1, calculate the reaction enthalpy for 2PH3(g)--->2P(s)+3H2(g)
Saturday, October 20, 2012 at 11:23pm by Sam

Chemistry
what are the coumpound names? Ex: H20: Dihyrdogen monoxide PH3 H3N H3PO2 CuSO4 P2O2 H2SO5 What is the formula? Ex: Nitric Acid: HNO3 Titanium (IV) Oxide:
Wednesday, January 12, 2011 at 7:41pm by Anonymous

science
I need help with balancing redox reactions Balance in acid solution: 1) PH3+ I2 --> H3PO4+ I- 2) ClO3- + Cl- --> Cl2
Tuesday, September 7, 2010 at 7:37pm by Joseph

chemistry
The answer by mohamed is correct except your teacher may have instructed you to write P as P4. If so that will change the equation but it will not change the number of grams PH3 formed.
Sunday, March 21, 2010 at 8:03pm by DrBob222

CHEMISTRY- intermolecular forces
What intermolecular forces act in the following: H2 PH3 CH3NH2
Wednesday, November 3, 2010 at 1:06am by Jasmin

Chem
How do you tell what type of solid (atomic, molecular, ionic, covalent network) will any substance form (i.e. PH3, H2, acetate)? I know that its mainly determined by what is at the lattice points but still have no clue how to go about it.
Tuesday, November 20, 2007 at 12:14am by Steve

Chemistry
The boiling point of phosphine, PH3(-88C) is lower than that of ammonia, NH3(-33C) even though phosphine has twice th molar mass of NH3. Why?
Tuesday, March 8, 2011 at 8:55pm by MMPM

Chem help
For which of the following molecules would the intermolecular forces be influenced mainly by dipole-dipole forces? PH3 CH3OHO HF C2H5OH CH3COCH3 how do I determine this
Friday, November 2, 2012 at 9:32pm by Lindsey

Chemistry
consider the following molecules:SiH4, PH3, H2S. What is similar about these molecules? What is different about these molecules and why?
Thursday, November 1, 2012 at 1:00am by Bhavna

Chemistry
When you say shape do you refer to the electronic geometry or the molecular geometry. I assume molecular geometry. PH3, CHCl3 and PO4^3- are correct. H2S is angular (like water). H | S-H
Wednesday, December 7, 2011 at 10:42am by DrBob222

Chemistry
NH3 has a higher b.p. than PH3 because of hydrogen bonding. The "old" answer for the higher b.p. I2 over F2 was higher molar mass; the "new" answer is increased "intermolecular" (London) forces.
Tuesday, December 4, 2012 at 5:44pm by DrBob222

MSJH
When heated, elemental phosphorus, P4, produces phosphine, PH3, and phosphoric acid, H3PO4. How many grams of phosphine are produced if 56 grams of P4 have reacted?
Friday, May 10, 2013 at 3:02am by MS

chemistry
When heated, elemental phosphorus, P4, produces phosphine, PH3, and phosphoric acid, H3PO4. How many grams of phosphine are produced if 56 grams of P4 have react
Friday, May 10, 2013 at 10:27am by ms

science
Which of the following has a boiling point which does not fit the general trend. NH3 PH3 SbH3 AsH3 I am going with NH3 as i think its to do with "the larger the compound the greater the boiling point"(Vander waals forces) Am I correct?
Tuesday, May 11, 2010 at 12:04am by Anonymous

chem 1211
P2 +3H2=2ph3 How many grams of ph3 can be formed when 37.5 grams of p2 and 83 L of h2 gas are reacted at 1 atm and 273.25 K? I really need a step by step of this problem. Thanks in advance!
Monday, October 21, 2013 at 8:54am by Sara

science
Balancing redox reactions Balance in acid solution 1. PH3+ I2 -> H3PO4 + I- 2. ClO3- + Cl- -> Cl2 Balance in basic solution Se -> Se2- + SeO3^2- BrO- + Cr(OH)4^- -> Br- + CrO4^2-
Tuesday, September 7, 2010 at 10:50pm by Joseph

need help for chemistry
Account for the following observation: 1)Ammonia is exceptionally soluble in water. 2)Hydrogen fluoride ,HF, has a higher boiling temperature than methane, CH4. 3)The boiling temperature of ammonia (NH3)is -33˚C but that of phosphine (PH3) is -88˚C
Monday, January 21, 2013 at 9:15am by Danial

please help me for chemistry
Account for the following observation: 1)Ammonia is exceptionally soluble in water. 2)Hydrogen fluoride ,HF, has a higher boiling temperature than methane, CH4. 3)The boiling temperature of ammonia (NH3)is -33˚C but that of phosphine (PH3) is -88˚C
Tuesday, January 22, 2013 at 11:41am by Danial

Chemistry
Why does I2 have a higher boiling point than F2? And why does NH3 have a higher boiling point than PH3?
Tuesday, December 4, 2012 at 5:44pm by Jeremy

Chemistry
Dr Bob Can you please confirm for me that only NH3 has a boiling point that does not fit the general trend from these choices NH3 PH3 SbH3 AsH3 many thanks andy I am picking NH3 because of the reason that the larger the compound the greater the boiling point Am I right with my...
Tuesday, May 11, 2010 at 7:36pm by Andy

chemistry
How many moles is 6.2 grams of P? How many moles is 4grams of H2? Notice in the balanced reaction it takes 1.5 moles of H2 for every one mole of P. If you have more of H than that, then the limiting reactant is P, otherwise the limiting reactant is H2. Use the moles of the ...
Monday, June 9, 2008 at 10:12am by bobpursley

chemistry
Balance each of the following equations a)CH4+CL2......>CCl4+HCl b)AL(OH)3+H2SO4.....>Al2(SO4)3+H2O c)Fe+H2O......>fe3O4+H2 d)Al4C3+HCl......>AlCl3+CH4 e)C2H6+O2......>CO2+H2O f)P2H4.......>PH3+P4 g)S2Cl2+NH3......>N4S4+NH4CL+S8 h)Ag+HNO3.......>AgNO3+...
Sunday, April 15, 2012 at 3:41pm by faisal

Chemistry
For the following: i) HClO4 > HBrO4 > HIO4 ii) NH3 > PH3 > AsH3 > SbH3 iii) HOClO3 > HOClO2 > HOClO > HOCl iv) HBr>HCl>HF The order of acidity is correct for which series? 1. ) all are correct 2. ) ii and iii 3. ) ii and iv 4. ) ii 5. ) i, iii, iv
Sunday, November 22, 2009 at 5:35pm by Apple

science
(Points: 10) For the following: i) HClO4 > HBrO4 > HIO4 ii) NH3 > PH3 > AsH3 > SbH3 iii) HOClO3 > HOClO2 > HOClO > HOCl iv) HBr>HCl>HF The order of acidity is correct for which series? 1. ) all are correct 2. ) ii and iii 3. ) ii and iv 4. ) ii 5...
Saturday, November 21, 2009 at 11:14pm by victor

science
(Points: 10) For the following: i) HClO4 > HBrO4 > HIO4 ii) NH3 > PH3 > AsH3 > SbH3 iii) HOClO3 > HOClO2 > HOClO > HOCl iv) HBr>HCl>HF The order of acidity is correct for which series? 1. ) all are correct 2. ) ii and iii 3. ) ii and iv 4. ) ii 5...
Sunday, November 22, 2009 at 12:24am by victor

chemistry
For the following: i) H3PO4 > H3AsO4 > H3SbO4 ii) H2Te > H2Se > H2S > H2O iii) HCl > HBr > HI iv) SbH3 > AsH3 > PH3 > NH3 The order of acidity is correct for which series? 1. ) all are correct 2. ) i and ii 3. )i, ii and iv 4. ) ii, iii 5. ii, iv...
Tuesday, November 24, 2009 at 2:32pm by bob

Chemistry
PH3The common name is phosphine. I would name this hydrogen phosphide (or trihydrogen phosphide) H3NThe common name is ammonia. I would name it hydrogen nitride (or trihydrogen nitride.) H3PO2 hypophosphorous acid CuSO4copper(II) sulfate). P2O2You may have meant P2O3--...
Wednesday, January 12, 2011 at 7:41pm by DrBob222

chemistry
In the series HI, HBr, HCl, HF, the boiling point decreases because the molar mass is decreasing; however, HF (remember F has the highest electronegativity of any element) has hydrogen bond which RAISES the boiling point of HF. H2O, NH3, HF are in the same category. HF should ...
Friday, December 31, 2010 at 3:50pm by DrBob222

Physiology
Indicate whether the following circumstances would tend to increase, decrease or have no effect on the rate of enzyme activity. 1.adding more substrate but keeping the amount of enzyme of the same 2.adding more enzyme but keeping the amount of substrate the same 3. adding a ...
Tuesday, February 15, 2011 at 12:47am by Jerome

chemistry
Because of hydrogen bonding. If you will note, the boiling point decreases from H2Te to H2Se to H2S but the electronegativity of O is large enough that H bonding takes a much larger effect. As a result the boiling point for H2O is much higher than we would expect it to be.(We ...
Thursday, January 29, 2009 at 8:43pm by DrBob222

chemistry
molar mass oxygen = 32/22.4 = about 1.43 and that time 1.38 = about 1.97. So the molar mass of the unknown gas must be 22.4 x 1.97 = about 44 and it must contain H. I ran through the acids (HF, HCl, H2S, NH3, PH3, etc and there is no density that will match 1.97 or even that ...
Thursday, December 8, 2011 at 11:18am by DrBob222

chemistry
I'm a little confused about what you mean by "change in temperature values." Do you mean that the boiling point of n-pentane and 1-butanol are significantly different? They do have similar molecular weights (also called molar mass) but 1-butanol has OH attached to it which ...
Thursday, February 4, 2010 at 8:31pm by DrBob222

chemistry
No. It has all to do with hydrogen bonding. That occurs with O, N, and F. HF has a much higher boiling point(higher than expected) than HCl; NH3 has a much higher boiling point (higher than expected) than PH3, and H2O has a much high boiling point (higher than expected) than ...
Sunday, September 16, 2012 at 10:56pm by DrBob222

science(chem)
Hi =) I have two Q's 1. What are the 2 purposes of using a caffine standard during the HPLC process? In general not talking about HPLC I would think a standard is for a)comparing to your own results to see how good your results came out. b) seeing if you have any contamination...
Saturday, February 2, 2008 at 10:59pm by ~christina~

Chemistry
You are right with your choice but wrong in the reasoning. If you looked up the boiling point of each, you would see that the boiling point changes from higher to lower as we go from SbH3, AsH3, PH3, etc and that is due to the decrease in size and but mostly because of ...
Tuesday, May 11, 2010 at 7:36pm by DrBob222

Chemistry
I am super confused when it comes to these types of questions! Can someone check my work? None of my answers matched those of my teacher when she read them this morning for last night's homework. Please help! 1. Consider the following equilibrium reaction: 2PH3(g) <-> 2P...
Monday, May 18, 2009 at 8:22pm by Samantha

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