Number of results: 7,839
Chemistry+need help checking work
Using aervage atmoic masses for each of the following elements, calculate the mass, in amu (grams) A. 635 atoms of hydrogen ---> 1 mole of H = 1.01g = 6.022 x 10^23 atom 635 atom of H 1.01g/6.022 x 10^23 atom I got 1.06 x 10^-21 amu. I got that answer buying the "E" button ...
Wednesday, January 7, 2009 at 7:28pm by Chopsticks
Can somebody check my answers? I Failed this test one time already. I do not want to fail it again. 1. When a pair of electrons is shared between two atoms, a covalent bond is said to have formed. Most often, the pair is formed A. by excess valence electrons. B. as one atom ...
Friday, August 26, 2011 at 8:40am by Amanda
Hydrogen burns with blue flame.Oxygen support burning when two atoms of Hydrogen combines with one atom of oxygen forms water this water put off the flames why?
Friday, August 26, 2011 at 8:53am by duppala
A Compound Containing 3 Atoms Of Carbon And 8 Atoms Of Hydrogen Is Combined In A Reaction With Oxygen Molecules. The Two End Products Of This Equation Are Carbon Dioxide And Water. What Element Should You Look At First In Balancing This Equation?
Sunday, August 9, 2009 at 10:28am by jennifer
A compound containing 3 atoms of carbon and 8 atoms of hydrogen is combined in a reaction with oxygen molecules. The two end products of this equation are carbon dioxide and water. What element should you look at first in balancing this equation? A. oxygen B. Hydrogen C. ...
Saturday, November 7, 2009 at 10:31am by William
How many atoms of hydrogen are in 220g of hydrogen peroxide (H2O2)? the molecular weight of H2O2 = 2*1 +2*16 =34 therefore, there are 220/34 moles of the molecule = 6.47 moles, so there are 6.47xAvogadro's number of molecules there are 2 H atoms per molecule, so multiply 2x6....
Wednesday, November 18, 2009 at 11:24pm by ana
How many atoms of hydrogen are in 220g of hydrogen peroxide (H2O2)? This is what I did so far: the molecular weight of H2O2 = 2*1 +2*16 =34 therefore, there are 220/34 moles of the molecule = 6.47 moles, so there are 6.47xAvogadro's number of molecules there are 2 H atoms per ...
Friday, November 20, 2009 at 6:35pm by ana
This is the last time I'm posting this question. So pleas don't get mad. How many atoms of hydrogen are in 220 g of hydrogen peroxide (H2O2)? (220)/(34) then i multiply that # with 6.02E23 then again i multiply that # with 2 to get the number of hydrogen atoms. no luck:-(
Sunday, November 22, 2009 at 3:21am by ana
Given: 3H2(g) + N2(g) 2NH3(g) If the reaction starts with 0.500 mol of H2, how many atoms of hydrogen in the compound NH3 would you expect to make?
Saturday, February 13, 2010 at 10:33pm by kp
1. You don't have an arrow but I assume it goes between N2 and 2NH3. 2. You have no Kp or Kc listed. 3. You won't make any hydrogen atoms. Perhaps you meant, "How many atoms of hydrogen will be in the NH3 formed."
Saturday, February 13, 2010 at 10:33pm by DrBob222
A compound containing 3 atom of carbon and 8 atoms of hydrogen is combined in a reaction wih oxygen molecules. The two end products of this equation are carbon dioxide (CO2)and water. What element should you look at first in balancing this equation?
Sunday, March 28, 2010 at 11:13pm by jessica
How many atoms of hydrogen are found in 2.48 mol of propane, C3H8? Someone can explain to me. Thanks
Saturday, April 3, 2010 at 7:10am by sam
A compound containing 3 atoms of carbon and 8 atoms of hydrogen is combined in a reaction with oxygen molecules. The two end products of this equation are carbon dioxide and water. Which chemical or element will have the largest number of moecules?
Monday, June 21, 2010 at 8:57am by charlie
Grade 11th Chemistry
You might try reading what you post. The question, as is, doesn't make sense. I'm sure you meant to write, "How many molecules of hydrogen and oxygen atoms .....". How many moles are in 0.9 g H2O. That will be moles = grams/molar mass. Convert moles H2O to molecules ...
Monday, June 28, 2010 at 1:55pm by DrBob222
Based on the law of definite composition, Dalton proposed that one atom of carbon combines with two atoms of oxygen to always produce CO2. Similarly,he proposed that two atoms of hydrogen combine with one atom of oxygen to give a molecule of H2O. Finally,Dalton reasons that ...
Friday, September 17, 2010 at 10:58am by Cliff
a. How many atoms of hydrogen are in 25.0 g of ammonia (NH3)? Use the format 6.02E+23 for 6.02 x 1023 b. How many atoms of nitrogen are in the same amount of ammonia?
Friday, September 17, 2010 at 9:22pm by kellie
a. How many atoms of hydrogen are in 25.0 g of ammonia (NH3)? Use the format 6.02E+23 for 6.02 x 10^23 b. How many atoms of nitrogen are in the same amount of ammonia I know to find the number of atoms in a gram of a sample you must multiply by 6.02*10^23. So i multiplied 25*6...
Monday, September 20, 2010 at 10:38am by kellie
For OCTANE, what is the ratio of Carbon atoms to Hydrogen atoms in a molecule? It's specified that Octane undergoes complete combustion to form 8L of Carbon Dioxide & 9L of Water at constant temp and pressure. thanks :)
Friday, September 24, 2010 at 7:44pm by kelly
MATH PLEASE HELP
A certain molecule contains twice as many atoms of hydrogen as oxygen and one more atom of carbon than hydrogen. If there are 31 atoms altogether in the molecule. how many atoms of carbon are there?
Tuesday, October 19, 2010 at 7:00pm by steph
In the chemical expression, 5 C2H4 : There are __________ molecules of Ethene represented which contain a total of _______ atoms of Hydrogen. Please give both answers in number form with a comma between numbers.
Monday, March 28, 2011 at 6:04pm by Anonymous