How many grams (to the nearest 0.01 g) of NH4Cl (Mm = 53.49 g/mol) must be added to 700. mL of 1.294M solution of NH3 in order to prepare a pH = 9.70 buffer? (pka of NH3 = 9.25)
25,271 results
Honors Chemistry
"How many grams of NH3 can be produced from the reaction of 28 g of N2 and 25 g of H2? N2 + 3H2 > 2NH3 ==> 28 g N2 x (1 mol N2/14.0 g N2) x (2 mol NH3/1 mol N2) x ( 17.0 g NH3/ 1 mol NH3) = 68 g NH3 25 g H2 x ( 1mol H2/2.0 g H2) x (2 mol NH3/3 mol H2) x

Chemistry
1)The chemical formula for aspirin is C9H8O4. What is the mass of 0.40 mol of aspirin? How would I find this? 2)The gram molecular mass of oxygen is 16.0 g right? 3)How would I find the mass, in grams, of 3.01 x 10^23 molecules of water? 1. Add the atomic

Chemistry
How many grams of dry NH4Cl need to be added to 2.10L of a 0.600M solution of ammonia,NH3 , to prepare a buffer solution that has a pH of 9.00? Kb for ammonia is 1.8x10^5. I just wanted to make sure I dd this write, can you please check my work? Thank

Chemistry
Which of the following reactions are spontaneous (favorable)? A] 2Mg(s) + O2(g) > 2MgO(s) Delta G = 1137 kJ/mol .. B] NH3(g) + HCl(g) > NH4Cl(s) Delta G = 91.1 kJ/mol ... C] AgCl(s) > Ag+(aq) + Cl(aq) Delta G = 55.6 kJ/mol .. D] 2H2(g) + O2(g) >

chemistry
Calculate Delta G for each reaction using Delta Gf values: answer kJ ...thank you a) H2(g)+I2(s)>2HI(g) b) MnO2(s)+2CO(g)>Mn(s)+2CO2(g) c) NH4Cl(s)>NH3(g)+HCl(g) is this correct? a) H2(g)+I2(s)>2HI(g) From tables: G HI = +1.3 kJ/mol G H2 = 0 G

Chemistry
Which of the reactions are spontaneous (favorable)? a. 2H2O(g)⟶2H2(g)+O2(g) Δ𝐺=457 kJ/mol b. CH4(g)+2O2(g)⟶CO2(g)+2H2O(l) Δ𝐺=−820 kJ/mol c. 2Mg(s)+O2(g)⟶2MgO(s) Δ𝐺=−1137 kJ/mol d. C(s)+H2O(l)⟶CO(g)+H2(g) Δ𝐺=90.8 kJ/mol e.

Statistics
A particular fruit's weights are normally distributed, with a mean of 308 grams and a standard deviation of 31 grams. The heaviest 9% of fruits weigh more than how many grams? Give your answer to the nearest gram.

AP Chem
Reaction 1: NaOH + HCL > H20 + NaCl delta H of 100.332 kj/mol Reaction 2: NaOH + NH4Cl > NH3 + H20 : delta H of 358.639 kj/mol Reaction 3: HCl + NH3 > NH4Cl : delta H of 51.701 kj/mol Use your answers from question 2 above and Hess's law to

chemistry
When 3.2 g of ammonium chloride is dissolved in 75 g of water, the temperature of the solution decreases from 22.8°C to 20.1°C. What is the energy of dissolution of NH4Cl per mole? (The molecular mass of NH4Cl = 53.49 g/mol, and the specific heat of

chemistry
If 15.0 grams of C3H6, 10.0 grams of oxygen, and 5.00 grams of NH3 are reacted, what mass of acrylonitrile can be produced assuming 100% yield, what mass of the excess reactants remain? 15g C3H6 (1 mol / 42.08 g) = .35 mol C3H6 .36 mol C3H6 ( 2 mol C3H3N /

Chemistry
If the theoretical molar enthalpy of solution for NH4Cl(aq) is +14.7 KJ/mol, what mass of NH4Cl is needed to decrease the temperature of 100.0g of water by 20.0oC. Write a thermochemical equation for this process, including the energy term. What would be

Chemistry
Given the following equation : 2Al+6HCl 2AlCl 3 +3H 2 If 3.00 grams of H 2 were produced, how many grams of Al reacted ? (Molar mass of Al = 26.98g / (mol) , molar mass of H 2 = 2.016 g/mol)

Chemistry
If you want to prepare 2.0 liters of a .25 M solution of NH4Cl, how many grams of the salt should you weigh out?

chemistry
3CuCl2 *2H2O + 2Al = 3Cu + 2AlCl3 + 6H2O Determine the number of grams that should have been produced when 1.25g of copper (2) chloride dehydrate reacts with excess aluminum so i'm not really sure how you're supposed to calculate the number of grams with

chemistry
Find the mass in grams. a. 4.30 x 10^16 atoms He, 4.00 g/mol b. 5.710 x 10^23 molecules CH4, 16.05 g/mol c. 3.012 x 10^24 ions Ca^2+, 40.08 g/mol

Chemistry
Can you check my calculations, please? It's for a lab we did in order to find the the enthalpy of formation of NH4Cl(s). My final answer was 299.4 kJ, while the theoretical, or actual, value is 314.4 kJ. It was the closest value out of everyone in the

Statistics
A particular fruit's weights are normally distributed, with a mean of 764 grams and a standard deviation of 33 grams. The heaviest 15% of fruits weigh more than how many grams? Give your answer to the nearest gram.

chem
How many grams of NH4Cl must be added to 0.560 L of 1.90 M NH3 solution to yield a buffer solution with a pH of 8.50? Assume no volume change. Kb for NH3 = 1.8 105. i am confused as how to find the grams?

General Chem
If I want to prepare 5.0 liters of a 0.25 M solution of NH4Cl, how many grams of the salt should I weight out?

chemisty help
for the reaction shown, compute the theoretical yield of the product in grams for each of the following initial amounts of reactants. Ti + 2F2 to make TiF4 There are 3 sub questions for this. Help me out with one, then I'll try to figure out the rest.

Chemistry
Combine and rearrange the neutralization of HCl by NH3 and the dissolution of NH4Cl in water to arrive at the decomposition of NH4Cl? I know the eq. is NH4Cl > NH3(g)+HCl(g) But I am confused how this works with the decomposition of H2O? Here is what I

statistic
A particular fruit's weights are normally distributed, with a mean of 228 grams and a standard deviation of 11 grams. The heaviest 20% of fruits weigh more than how many grams? Give your answer to the nearest gram.

CHEM
Can you please check my work? I got 4.3KJ/mol If this is not right can you tell me what I am doing wrong? Thank you! Questions. 1.a. Use Hess's Law and the measured mean enthalpy changes for the NaOHHCl and NH3HCl reactions to calculate the enthalpy

Chem
NH4Cl(s) → NH3(g) + HCl(g) ΔH°=176 kJ/mol At 25 °C, this reaction has a ΔG° of 91.1 kJ/mol. What is the ΔS° of this reaction?

Chemistry
When 3.2 g of ammonium chloride is dissolved in 75 g of water, the temperature of the solution decreases from 22.8°C to 20.1°C. What is the energy of dissolution of NH4Cl per mole? (The molecular mass of NH4Cl = 53.49 g/mol, and the specific heat of

Chem
1) Which solution will have the lowest OH A) Na2CO3 B) NaHCO3 C) NaCl D) NaHSO4 E) NH4Cl 2) Which solution will be the strongest base? A) Na2CO3 B) NaHCO3 C) NaCl D) NaHSO4 E) NH4Cl 3) Which aqueous solutions are acidic? A) Na2CO3 and NaHCO3 B) NaCl and

Chemistiy
For the reaction: Ba(OH)2 (s) + 2 NH4Cl (s) → BaCl2 (s) + 2 H2O (l) + NH3 (g) If ammonia gas (NH3) is produced at the rate of 0.72 mol/s, what is the corresponding rate of consumption of ammonium chloride? ANS: NH4Cl is consumed at a rate of 1.4 mol/s,

chemistry
If my original sample contained 7.1 grams of potassium chlorate. How many moles of oxygen gas would I expect to have evolved? Hint: Convert grams to moles of potassium chlorate, then use the mole ratio in the balanced equation. Balance this equation KClO3

Chemistry
Could someone please check my answers/work for the following questions. EQUATION: 3H2+N2 >2NH3 1) How many grams of NH3 can be produced from 3.98 mol of N2? 3.98 mol N2(2 mol NH3/2 mol H2)=2.65 mol Convert to grams: 2.65(17.0)=45.14g 2.)How many grams of

chemistry
Calculate the theoretical percentage of water in gypsum, rounded to the nearest whole number %. (calcium sulfate dihydrate; CaSO4 ° 2H2O; Ca = 40 g/mol, S= 32 g/mol; O= 16 g/mol; H= 1 g/mol).

chemistry
Ammonia and oxygen react to form nitrogen and water. 4NH3(g)+3 O2(g)2N2(g)+6H2O(g) a.How many grams of O2 are needed to react with 8.00 mol NH3? 8.00 mol NH3 x42.094/4 mol NH3 x32.00 O2/1 mol O2=269gO2

science
How many grams (to the nearest 0.01 g) of NH4Cl (Mm = 53.49 g/mol) must be added to 700. mL of 1.294M solution of NH3 in order to prepare a pH = 9.70 buffer? (pka of NH3 = 9.25)

Chemistry
The solubility of NH4CL is 50g/100g of water at 50°C. How many grams of NH4CL will dissolve in 20 g of water?

Chemistry
Calculate the pH after 0.010 mol gaseous HCl is added to 250.0 mL of each of the following buffered solutions: a. .050 M NH3/.15 M NH4Cl b. .5 M NH3/ 1.5 M NH4Cl

chemistry
Methanol (CH3OH) is used in the production of many chemicals. Methanol is made by reacting carbon monoxide and hydrogen at high temperature and pressure. CO(g) + 2 H2(g) CH3OH(g) (a) How many moles of each reactant are needed to produce 4.83 102 g CH3OH?

chemistry
Ammonia and oxygen react to form nitrogen and water. 4NH3(g)+3 O2(g)2N2(g)+6H2O(g) a.How many grams of O2 are needed to react with 8.00 mol NH3? 8.00 mol NH3 x42.094/4 mol NH3 x32.00 O2/1 mol O2=269gO2

Chemistry
which conversion factor do you use to first calculate the number of grams of CO2 produced by tge reaction of 50.6 CH with O2? The equation for the complete combustion of methane is: CH4 (g) + 2o2 (g) > CO2 (g) +2H2o (l) a. 2 mol O2/1 mol CO2 b. 1 mol

college chem
how many grams of NH4Cl are required to prepare 250 mL of .122 M NH4Cl solution? I set this up using the molarity equation and the part that I was missing is moles. So I divided the 0.122 by .25 L and got .031 mol. Then I took that and multiplied it by the

Chemistry
Very confused! Converting between grams of a compound and grams of a constituent element Determine the mass of oxygen in a 5.8 g of NaHCO3 5.8 g NaCHO3 * 1 mol NaCHO3/ 84.01 NaCHO3 * 48.00 mol O / 1 mol NaCHO3 * 16.00 g O/ 1 mol = I got 53 but the answer

Chemistry
Which of the following combinations will make a good buffer solution? 0.05 M H2CO3 + 0.05 M KHCO3 0.5 M HI + 0.5 M CsI 0.3 M NH4Cl 0.3 M NH4Cl + 0.1 M NH3 0.3 M NH4Cl + 0.1 M HCl thanks

chem
If one pound (454g) of hexane combusts with 185 grams of oxygen which reactant is the limiting reactant and how many grams of carbon dioxide are produced? My work: 454 g C6H14 * 1 mol C6H14/86.18 g C6H14 * 6 mol CO2/ 1 mol C6H14 * 44 g C02/ 1 mol CO2=

chemistryplease check my work
Determine the mass of carbon monoxide that is produced when 45.6 g of methane CH4 react with 73.2 g of oxygen gas, O2. The products are CO and H2O. Please check my work: CH4 + 3O2 > 2CO + 2H20 nCH4=2.84 mol nO2=4.58 mol Limiting Reactant: 1 mol CH4/2.84

Chemistry
How many moles of ions are in 1.0 mol NH4Cl?

Chemistry
According to the following reaction, how many grams of iron(III) chloride will be formed upon the complete reaction of 27.1 grams of chlorine gas with excess iron? The balanced eq is 2Fe+3Cl2=2FeCl3 Here is my worked out equation: 27.1g Cl*1 mol Cl/35.46 g

Chemistry
How many grams of NH4Cl must be added to 250ml of .2M NH4OH in order that the solution shall have a pH of 7.2?

chemistry
If 25 g of NH4Cl is dissolved at 80C, how many additional grams would be needed to make the solution saturated?

chemistry
Calculate the following quantities. (See the periodic table.) (a) mass, in grams, of 2.54 102 mol of CdS g (b) number of moles of NH4Cl in 90.0 g of this substance mol (c) number of molecules in 5.081 102 mol C6H6 molecules (d) number of O atoms in 4.72

Chemistry
NH4Cl(s) → NH3(g) + HCl(g) ΔH°=176 kJ/mol At 25 °C, this reaction has a ΔG° of 91.1 kJ/mol. What is the ΔS° of this reaction? I came up with the solution of 0.896 kJ/mol. Is this correct?

science
determine the number of grams of NH4CL that will dissolve in 100 grams of water at 25 Celcius.

Inorganic chemistry
One kind of battery used in watches contains mercur(II) oxide. As current flows, the mercury oxide is reduced to mercury. HgO(s) + H2O(l) + 2e^ ==> Hg(l) + 2OH^(aq) If 2.5x10^5 amperes flows continuously 1095 days, what mass of Hg(l) is produced?

chem
Using the balalnced chemical equation, how many grams of MgO are produced when 31.0 grams of O2 react completely with Mg? 2 Mg + O2 → 2 MgO Molar Mass Mg = 24.3 g/mol O2 = 32.0 g/mol MgO = 40.3 g/mol 55.7 78.1 89.1 111.3

Chem
Molar mass, sometimes referred to as molecular weight, is the mass of one mole of a substance, and is usually expressed in A Liters B Grams C Density D Moles D? The mole is derived from the quantity of atoms in 12 grams of carbon12. The mole is just a

chemistry
Methanol (CH3OH) is used in the production of many chemicals. Methanol is made by reacting carbon monoxide and hydrogen at high temperature and pressure. CO(g) + 2 H2(g) CH3OH(g) (a) How many moles of each reactant are needed to produce 4.83 102 g CH3OH?

Chemistry
My question is what is the molar mass of 1.00 mol of Li? Can you explain in detail and I have another question: What is the molar mass od 1.00 mol of Ag but if you help me with the first question, then can you just tell me to the other by myself so I can

chemistry
What mass of solute is contained in 250 mL of 0.895 M NH4Cl? I think that this is a molarity question. Molarity = mass of solute/volume of solution in L. 1 mL = 0.001 L so 250 mL * 0.001 L = 0.25 L 0.895 M = X (mass of solute)/ 0.25 but since the answer is

Chemistry
Posted by Cyndy on Sunday, February 15, 2015 at 6:45pm. How many grams of ammonium chloride are needed to raise the ammonia level 5 ppm in a 300 gallon system? Now, I have worked the problem so many times I have confused myself I think. I keep getting 2

Chemistry
Hi I have a question So I have to determine the final concentration of NH4Cl in a calorimeter assuming reaction goes to completion. Given Measurements are: delta T = 9.25 degrees Celcius Density of NH4Cl = 1.013 g/mol capacity of NH4Cl= 3.93 J/g*C

CHEMISTRY
Whats the pH of the solution which can be prepared by mixing same volumes of 0.5% NH4Cl and 0.25% KOH ? (K=1.8 * 10^5) M(NH4Cl) 53.5 g/mol M(KOH)=56g/mol

chemistry
22.0 ammonium chloride decomposes to form hydrochloric acid, and ammonia. at the conclusion of the reaction, the scientist collects 10.24L of ammounia measured at 52 degrees Celsuis and 105.3 kPa. What was the percent yield of the reaction? Write the

Gen. Chem 1
The density of 18% nh4cl is 1.05 grams/ml. What mass of nh4cl is in 425 ml of the solution?

chemistry
assuming the reaction goes to completion, determine the final concentration of NH4Cl in the calorimeter. NH4Cl(s)+ H2O(l)> NH4Cl(aq) concentration of NH4Cl is 1.00M its specific heat is 3.93 and density is g/ml. note: the exact same question was asked for

chemistry
Assuming reaction goes to completion, determine the final concentration of NH4Cl in the calorimeter. heat capacity =3.03J/g.c density =1.012 5g of NH4Cl used 100 mL of water used NH4Cl(s) + H2O(l) > NH4Cl(aq)

chem
the combustion of 1.83 grams of a compound which only contains C,H, and O yields 4.88 grams of CO2, and 1.83 grams of H2O. What is the empirical formula of this compound?  4.88 g CO2 x 1 mol CO2/44.01 g CO2 x 2 mol

AP Chem
Calculate the pH after 0.010 mol gaseous HCl is added to 250.0 mL of each of the following buffered solutions: a. .050 M NH3/.15 M NH4Cl b. .5 M NH3/ 1.5 M NH4Cl

Chemistry
I did a lab where I put Copper (II) Chloride in water with Alumnim. 2Al + 3CuCl2 > 3Cu + 2AlCl3 The aluminum on the reactant side weighs 0.5 g and the CuClw weighs 1.69 grams. It said to find the theoricital yield. Did I do this right? 2Al + 3CuCl2 > 3Cu

bio chemistry
calculate the PH of each of the following buffers prepared by placing in 1.0 L of solution 0.10 mol NH3 and 0.10 mol of NH4CL

9th grade chemistry
At what temperature will 50. grams of NH4Cl just saturate 100. grams of water? (the 4 is the number of elements)

Chem
4.30 grams of NH4Cl is added to 14.5 grams of water. Calculate the molality of the solution

Chemistry
1. Ammonia gas can be prepared by the following unbalanced equation: _____ CaO(s) + _____ NH4Cl (s) > _____ NH3(g) + _____ H2O(g) + _____ CaCl2(s) a. Balance the equation. CaO + 2NH4Cl = 2NH3 + H2O + CaCl2 b. Suppose you begin this reaction with 112.

CHEM
Please help me, i don't know how to approach this question! All ammonium salts on heating with sodium hydroxide produce ammonia gas. From which ammonium salt can the greatest mass of ammonia be obtained? a)0.5 mol of (NH4)3PO4 b)0.5 mol of (NH4)2SO4 c)1

Chemistry
50.0 grams of RbNO3 (MM is 147.48 g/mol) and 75.0 grams of Rb were combined to react via the balanced equation shown below. How many grams of Rb2O (MM is 186.94 g/mol) should be formed? 10Rb + 2 RbNO3 > 6Rb2O + 1N2

Chemistry
A solution of NaOH(aq) contains 7.7 grams of NaOH in 93 mL of solution. Calculate the pH at 25◦C.  7.7 grams x (1 mol/39.997 grams) = 0.19 mol 0.19 mol/0.093 L = 2.07 M pOH = log(2.07) = 0.316  Am I doing anything wrong? Why am I getting a

Chemistry
A solution is 0.10M in aqueous NH3. Calculate (a) the number of moles and (b) the number of grams of NH4Cl that must be added to 500mL of this solution to prepare a buffer solution with pH=9.15. You may neglect the volume change due to addition of solid

chemistry
what mass of ammonium chloride is dissolved in 100 grams water in each of the following solutions in 1.10 molal NH4Cl solution, in a solution which is 75% water by mass in solution with a mole fraction of 0.15 NH4Cl? please help me solve this problem.

CHEM
am lost. I have to create a buffer using NH4CL and 0.10 M NH3. I have to chose how much of the reagent to use in order to get a concentration between 0.01 and .5 M. Then after I come up with the recipe for that I have to calculate the pH based on the

chemistry
the clinical NH4Cl injection for treating alkalosis is 220ml per tube,each containting 0.160g NH4Cl. calculate the CNH4Cl and Cos,NH4Cl of the injection.and how does the erythrocyte behave in this solution?

Chemistry
If a sample of Co2(CO)8 is found to contain 6*10^2 mol of C atoms, how many grams of Co atoms are present? Molar Mass (g/mol) Co2(CO)8  341.95 Co atom  58.933 C atom  12.011 O atom  15.999 Avaogadro's No.: 6.022*10^23 Do I need to use the 6*10^2 mol

Chemistry
A sample of zinc metal reacts completly with an excess of hydrochloric acid: Zn(s) + 2HCl(aq) > ZnCl2(aq) + H2(g) The hydrogen gas produced is collected over water at 25.0 °C. The volume of the gas is 78.0 L & the pressure is 0.980 atm. Calculate the

Chemistry
Another Equilibrium Question! The following reaction is at equilibrium in a closed 20.0L container. At equilibrium, the pressures of NH3 and HCl are both equal to 0.00552 atm, and the mass of NH4Cl (s) is 35.4 g. Calculate the equilibrium pressure of NH3

Chemistry
NH4NO3(s) ¡æ N2O(g) + 2H2O(§¤). How much water is produced if 22.9 g of N2O is produced in this reaction? Answer in units of g I converted grams of N2O to mol. Then I did a mol ratio getting mol of H2O. Then I converted mol of H2O to grams. I got

Chemistry
NH4Cl(s) → NH3(g) + HCl(g) ΔH°=176 kJ/mol At 25 °C, this reaction has a ΔG° of 91.1 kJ/mol. What is the ΔS° of this reaction?

chem
if one pound (454g) of hexane combusts how many grams of water are produced? my work: 454 g C6H14 * 1 Mol C6H14/86 g C6H14 * 7H20/1 mol C6H14 * 18 g O2/ 1 MOL H2O = 665.2 grams of H2O

Chemistry
You know how when you do calculations for the enhaloy change of a reaction you start sort of like this?: NH3(aq) + HCl(aq) → NH4Cl(aq) 25 mL 25 mL 1.0 mol/L 1.0 mol/L n = c x v = 1 mol/L x 0.025L = 0.025 mol How come you only need the moles of one of the

chemistry
How many grams of NH4Cl will dissolve at 50 degrees C?

math
how do you calculate theoretical yield of something? I don't know where to find the formula You go to the balanced chemical equation, and look at the mole ratio between the reactants and products. The theoretical yield is the value calculated from

Check a chemistry answer
So I think I have done this problem right, I was just wondering if anyone would check over it for me. What mass (in grams) of P2O5 contains 1.20 x 1023 atoms of phosphorus? 1.20E23 atoms of P x (1 mol/ 6.022E23 atoms) x (5 mol O/ 2 mol P) x (1 mol P2O5/ 5

chemistry
A solution was made by dissolving 62.07 grams of a compound in 500.0 g of water. The compound was not ionic. The freezing point of the solution was measured and found to be – 1.86oC. Using the Kf value in your textbook , the molar mass of this compound

Chemistry
How many grams of NH4Cl do I have to add to 500 mL of 0.100 M NH4OH to have a pH of 9.40? Kb= 1.8 x 10^5 [OH]= 2.51 x^5 M

Chemistry  PLEASE CONFIRM ANSWER.
determine the mass of CO that is produced when 45.6g of CH4 react with 73.2g of O2. 2CH4 + 3O2 >2CO + 4H2O nCH4 = 45.6 g/16.05 g/mol =2.84 mol nCO=2.84 mol mCO=n*M =2.84*28.01 =79.5 grams

chemistry
A solution was made by dissolving 62.07 grams of a compound in 500.0 g of water. The compound was not ionic. The freezing point of the solution was measured and found to be – 1.86oC. Using the Kf value in your textbook , the molar mass of this compound

Chemistry
Calculate enthalpy change when 35.0 grams barium oxide reacts with 5.00 grams of aluminum. 0.228 mol BaO ( limiting reagent) 0.1853 mol Al Molar Ratio 1.23 1669.8  3(558.1) = 3344.1 kJ/mol 0.228 BaO reacts therefore: (0.228/3) x 3344.1 = 254.2 kJ

Chem
The question is telling me that NaOH (24.00 grams) is diluted in water (750 mL). Find the pH and pOH. This is what I did so far: NaOH > Na+ + OH NaOH: mass = 24.00 grams v= 750 ml = 0.750 L M= 40.00 grams/mol n= 0.6000 mol c= 0.800 mol/L Since NaOH

science
How many grams of Aluminum will react w/ 1 liter of a 1M solution of Fe^3+? wat steps do i need to take to solve this? Al + Fe+3==> Fe+2 + Al+3. Here are the steps for solving a stoichiometry problem. Step 1. Write the balanced equation. You have the

Principles of Tech
how Many grams of NH4CL can be dissolved in 100 mls of water at 70 degress celesis?

chemistry
What is the pH of a solution made by adding grams of NH4Cl, to 550 mL of 0.205 M NaOH?

chemistry
thermochemistry chem conceptual. i just want to check my understanding of this Say you got this: 1)A + b=c A=4.0 grams and 91.8kj evolve How do you find change of H ? I guess you convert A to grams and then shove it under the evolved heat ? ie. change of

Chemistry
How many grams of butane must be burned to provide the heat needed to melt a 85.0g piece of ice (at its melting point) and bring the resulting water to a boil (with no vapourization)? Assume a constant pressure of 1 bar and use the following data:

chemistry
Experiment: Gravimetric Determination of Phosphorus in Fertilizer Samples 1. Can NH4Cl be used as a substitute to precipitate the phosphorus in the sample? Why or why not?  I think, NH4Cl can be used although I'm not quite sure if Cl ions have some

Chemistry
Calculate the mass and moles of iodine that reacted in the formation of 2.7132 grams of ZnI2. im slighty confused about the use of iodine, would it be diatomic in the equation for example would i use the conversion 1 mol ZnI2 = 1 mol I2 or 1 mol ZnI2 = 2

Math/Chemistry
the atomic mass of an element is the mass, in grams, of one mole (mol), or 6.02 * 10^23. A.) How many atoms are there in 3.5 mol od carbon? B.) If you know that 3.5 mol of carbon weighs 42 grams, what is the atomic mass? C.)Using you answer from (B), find