Wednesday
November 26, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

Post a New Question | Current Questions

Chemistry
Calculate ΔG∘ at 298 K for the following reactions. A) Ca(s)+CO2(g)+12O2(g)→CaCO3(s) B) 2KClO3(s)→2KCl(s)+3O2(g) C) CO(g)+H2O(g)→H2(g)+CO2(g)
Monday, May 12, 2014 at 6:25pm

Chemistry
Consider the following reaction: CaCO3(s)→CaO(s)+CO2(g). Estimate ΔG∘ for this reaction at each of the following temperatures. (Assume that ΔH∘ and ΔS∘ do not change too much within the given temperature range.) A) 310K and is it ...
Monday, May 12, 2014 at 6:24pm

chemistry
a piece of iron measures 10.5cm by 5.25cm by 10.2mm and the density of theiron is 7.86g/cm cubed. what is the mass of the iron?
Monday, May 12, 2014 at 12:23pm

science
can u suggest 5 advantages and 5 disadvantages of diffusion in chemistry
Monday, May 12, 2014 at 12:02pm

chemistry
An ideal solution of 5.00 mole benzene and 3.25 mole toluene. At 298 K, the vapor pressure of the pure benzene and toluene were 96. Torr, and 28.9 Torr, respectively. At what pressure does the vapor phase appear first, if the pressure above this solution is reduced from 760 ...
Monday, May 12, 2014 at 5:55am

chemistry
preparation of N/10 NaoH
Monday, May 12, 2014 at 3:58am

chemistry
Radioactive decay is a process that follows first-order kinetics. The half-life of 32P is 0.03920 years; how long (in minutes) would it take for the amount of 32P to decrease to 53.25% of its initial amount? I don't understand at all what to do here
Sunday, May 11, 2014 at 9:29pm

Chemistry 104
The pH of 0.3 HSO3- is: (How can this problem be solved?) The final answer is 4.41 However, I keep getting 3.76
Sunday, May 11, 2014 at 8:02pm

Chemistry Who step by step
A 0.8870g sample of a mixture of nacl and nan03 is dissolved in water, and the solution is then treated with an excess of AGN03 to yield 1.913g of agcl. Calculate the percent by mass of the nacl in the mixture. 1.913g / 143 = 0.0133 x/58 ( 0.8870g -x) y/85 = 0.0133 0.01529 - 0...
Sunday, May 11, 2014 at 6:29pm

chemistry
Answer the following math questions focusing on significant figures a. 45.3L x 10 mol/L = b. 67.894 g ÷ 2.56 L = c. 45.3m + 12.344m + 1000m – 1.34m = d. 35cm + 8.3m + 75.341 km + 80,000 mm = e. (43.7m + 39.3cm) ÷ 25.332 m/s =
Sunday, May 11, 2014 at 5:45pm

chemistry
how many significant figures do the following numbers have? a. 1.2056 x 10^4 m: b. 1 x 10^89 km: c. 12,000 L: d. 0.000345 cm: e. 1.00036 mL: f. 0.2056000 m:
Sunday, May 11, 2014 at 5:34pm

(2-8) Chemistry - Science (Dr. Bob222)
Which of the following statements is correct? A) The internal energy of a system increases when more work is done by the system than the heat that flows into the system. B) The system does work on the surroundings when an ideal gas expands against a constant external pressure...
Sunday, May 11, 2014 at 3:59pm

Chemistry
if you produce 5.7 of H2O, how many liters of O2 will be required?
Sunday, May 11, 2014 at 2:32pm

Chemistry
How can I determine the overall electrochemical reaction that proceeds spontaneously? Cd2+ | Cd, Co2+ | Co 1. Cd+Co2+ −¨Cd2++Co 2. Co+Cd2+ −¨Co2++Cd (1. and 2. are answer choices)
Sunday, May 11, 2014 at 2:17pm

Chemistry
Given the Na+/Na and K+/K half-cells, determine the overall electrochemical reaction that proceeds spontaneously and the E0 value. Answer in units of V Can you please explain the steps?
Sunday, May 11, 2014 at 2:12pm

chemistry
What is the energy released when steam at 25 g of steam at 10 degree celcius is cooled to ice at-10 degree celcius work heat change for the following changes calculated 150 degree Celsius steam --150 degree water 150 degree water to 0 degree water 100 degreewater-- 0 degree ...
Sunday, May 11, 2014 at 1:52pm

Chemistry help
I am not to sure how to approach the problem... Hydrazine is used as a rocket fuel because its reaction with oxygen is extremely exothermic: N2H4(liquid) + O2(g) ==> N2(g) + 2H2O(liquid) ΔH(reaction) = -615 kJ mol-1 What is the enthalpy of this reaction if water were ...
Sunday, May 11, 2014 at 12:10pm

chemistry
A solution is made by dissolving 811.0 cg of barium hydroxide, Ba(OH)2, in 0.1137 kg of water. What is the concentration in parts per million? I know the equation is: ppm= (mass of solute/mass of solution)10^6 Does the mass need to be in g or kg?
Sunday, May 11, 2014 at 11:33am

chemistry
Consider the following system, which is at equilibrium, 3C(s) + 3 H2(g) mc020-1.jpg CH4(g) + C2H2(g) The result of removing some C(s) from the system is that a) more CH4(g) and C2H2(g) are produced to replace that which is removed. b) Kc decreases. c) more C(s) is produced. d...
Sunday, May 11, 2014 at 8:50am

chemistry, first year university
Solid NH4N3 decomposes explosively according to the following equation: NH4N3(s) ⇌ 2N2(g) + 2H2(g) A small amount of ammonium azide was placed in a sealed container and the air was removed. The sample was then detonated. At equilibrium the total pressure in the container...
Sunday, May 11, 2014 at 8:49am

chemistry
Write equations for the ionisation in water of : A) hydrobromic acid B) nitrous acid C) carbonic acid D) sulfuric acid
Sunday, May 11, 2014 at 7:32am

chemistry
Why is it recommended to carry out iodometric titration as quickly as positive and to get the first end point?
Sunday, May 11, 2014 at 1:10am

chemistry
Match the name or structure with its functional group. Each molecule has only one functional group. My choices are alkane, alcohol, alkyne, carboxylic acid, alkene, aldehyde, ketone, ester, and ether. 1. 2-propanol- alcohol 2. 2-methoxypentane- alkane 3. formaldehyde- aldehyde...
Saturday, May 10, 2014 at 9:15pm

Chemistry
During an acid-base titration, 25 mL of NaOH 0.2 M were required to neutralize 20 mL of HCl. Calculate the pH of the solution for each: a) Before titration b) After adding 24.9 mL of NaOH c) At equivalence pt d) After adding 25. 1 mL of NaOH e) The pH of the equivalence pt ...
Saturday, May 10, 2014 at 7:58pm

Chemistry - Science (Dr. Bob222)
Liquid chloroform (CHCl3) is placed in a closed container and allowed to equilibrate with chloroform vapor. With the temperature held constant, additional chloroform is introduced into the system, and the vapor-liquid equilibrium is reestablished. Following this, the ...
Saturday, May 10, 2014 at 7:12pm

Chemistry
How would you write these chemical reactions?Can someone do one or two reactions for each problem, so I could get an idea of to them? ..I'm nit sure how most of the oeoducts wouls turn out..especially if it is a precipitate. 5. When Mn^2+ ions are separated from the ...
Saturday, May 10, 2014 at 5:33pm

Chemistry
Please explain how to set this problem: A solution has a density of 1.73 g/ml. If it's weighs 4.3 ounces, what is the volume. ?
Saturday, May 10, 2014 at 5:24pm

chemistry
This functional group can be generated by oxidation of an aldehyde. Oxidation is just the reaction with oxygen, but unlike combustion you are not producing carbon dioxide and water.
Saturday, May 10, 2014 at 5:15pm

chemistry
One kind of battery used in watches contains mercury(II) oxide. As current flows, the mercury(II) oxide is reduced to mercury. HgO(s) + H2O( ) + 2 e–  Hg( ) + 2 OH–(aq) If 2.3  10–5 amperes flows continuously for 1200 days, what mass of Hg( ) is ...
Saturday, May 10, 2014 at 4:47pm

chemistry
This type of functional group is often sweet smelling and may be used as a fragrance. When it reacts with water it will produce a carboxylic acid and an alcohol. I chose ester but it is wrong
Saturday, May 10, 2014 at 4:24pm

Organic Chemistry
A student obtains a yield of 79% from his salicylic acid. How many grams of salicylic acid will the student need to produce 135 g of aspirin?
Saturday, May 10, 2014 at 11:09am

(1-22)Chemistry - Science
Consider the following reaction: C(s) + H2O (g) ⇌ CO (g) + H2 (g) (Kp = 0.45 at 900 K) What is the equilibrium partial pressure of H2O when the initial partial pressure of water is 1.00 atm? a) 0.43 atm b) 0.58 atm c) 0.22 atm d) 0.52 atm e) 1.16 atm
Saturday, May 10, 2014 at 10:26am

(1-17)Chemistry - Science
Consider the reaction: SO2 (g) + NO2 (g)  SO3 (g) + NO (g) At T = 1000 K, where the reaction is exothermic with an equilibrium constant K = 9.00 If the reaction vessel is instead charged initially with SO3(g) and NO(g), each at a partial pressure of 0.500 atm, the ...
Saturday, May 10, 2014 at 10:24am

(1-16)Chemistry - Science
Consider the reaction: SO2 (g) + NO2 (g) ==> SO3 (g) + NO (g) At T = 1000 K, where the reaction is exothermic with an equilibrium constant K = 9.00 The reaction vessel is charged initially with all four gases, each at a pressure of 0.5 atm. After equilibrium is achieved, ...
Saturday, May 10, 2014 at 10:23am

(1-15) Chemistry - Science
Assume a gas of molecular mass M g/molecule obeys the Maxwell Boltzmann distribution of speeds at temperature T. If u2> u1, the ratio of the number of molecules at speed u2 to the number at speed u1 a) is always less than one. b) is always greater than one. c) can be either...
Saturday, May 10, 2014 at 10:20am

(1-13) Chemistry - Science
Which of the following effects will make the ratio (PV) / (nRT) less than 1 for a real gas? a) The gas molecules are large enough to occupy a substantial amount of space. b) A large number of molecules have speeds greater than the average speed. c) The gas molecules have a ...
Saturday, May 10, 2014 at 10:19am

1-12. Chemistry - Science
At STP, 3.0 L of D2 reacts completely with 3.0 L of E, producing 1.5 L of a product. What is the formula of the product?
Saturday, May 10, 2014 at 10:17am

(1-11) Chemistry - Science (Dr. Bob222)
Liquid chloroform (CHCl3) is placed in a closed container and allowed to equilibrate with chloroform vapor. With the temperature held constant, additional chloroform is introduced into the system, and the vapor-liquid equilibrium is reestablished. Following this, the ...
Saturday, May 10, 2014 at 8:12am

chemistry
The vapour density of a gas is 22.4 and mass is. 22.4grams.what is the volume occupied the gas at N .T .P ?
Friday, May 9, 2014 at 4:56pm

Science, Chemistry
Hess's law ____. A) makes it possible to calculate ΔH for complicated chemical reactions B) states that when you reverse a chemical equation, the sign of ΔH does not change. C) determines the way a calorimeter works D) describes the vaporization of solids Highly ...
Friday, May 9, 2014 at 3:44pm

Chemistry
The pH of a .200M HBrO solution is 4.67. What is the acids Ka?
Friday, May 9, 2014 at 11:14am

Chemistry
What would be the freezing and boiling points of a solution prepared by dissolving 1.00g of benzoic acid (C6H5CO2H) in 10.0g of benzene?
Friday, May 9, 2014 at 8:07am

chemistry
What would be the freezing and boiling points of a solution of 5.00g of sodium chloride dissolved in 25.0g of water?
Friday, May 9, 2014 at 8:07am

chemistry
20 mL of 0.125 M potassium iodide solution is mixed with 10 mL of 0.1 g L–1 sodium thiosulfate solution and 0.2 g of solid iodine indicator is added. To this solution is added 20 mL of 0.025 M peroxodisulfate solution. After 46 seconds a blue colour appears, indicating ...
Friday, May 9, 2014 at 6:03am

chemistry
hydrogen may not be advantagous as a fuel because
Friday, May 9, 2014 at 1:14am

CHEMISTRY HELP !!!! CHECK !!!
Al3+ is reduced to Al(s) at an electrode. If a current of 2.75 ampere is passed for 36 hours, what mass of aluminum is deposited at the electrode? Assume 100% current efficiency. a. 9.2 x 10–3 g b. 3.3 x 101 g c. 9.9 x 101 g d. 1.0 x 102 g e. 3.0 x 102 g Answer 2.75 A for...
Thursday, May 8, 2014 at 11:54pm

CHEMISTRY HELP ! Check Please!
Calculate the cell potential, at 25 C, based upon the overall reaction Zn2+(aq) + 2 Fe2+(aq) -> Zn(s) + 2 Fe3+(aq) if [Zn2+] = 1.50 x 10-4 M, [Fe3+] = 0.0200 M, and [Fe2+] = 0.0100 M. The standard reduction potentials are as follows: Zn2+(aq) + 2 e– --> Zn(s) E&#...
Thursday, May 8, 2014 at 11:30pm

chemistry
If 80.6 pounds of alcohol are mixed with 42.7 pounds of water, what is the percent of water (by weight) in the mixture? Answer in units of %
Thursday, May 8, 2014 at 11:03pm

chemistry
If 59.4 pounds of alcohol are mixed with 28.3 pounds of water, what is the percent alcohol (by weight) in the mixture? Answer in units of %
Thursday, May 8, 2014 at 11:02pm

chemistry
what is the final temperature of amixture containning 25 grams of ice at -20 degree celciusadded to water at room temperature 22oC mass of water is 50g
Thursday, May 8, 2014 at 8:16pm

Chemistry
The voltage generated by the zinc concentration cell described by, Zn(s)|Zn2 (aq, 0.100 M)||Zn2 (aq, ? M)|Zn(s) is 21.0 mV at 25 °C. Calculate the concentration of the Zn2 (aq) ion at the cathode.
Thursday, May 8, 2014 at 8:00pm

Chemistry 104
A current of 3.40 A is passed through a Ni(NO3)2 solution for 1.80 hours. How much nickel is plated out of the solution?
Thursday, May 8, 2014 at 7:59pm

Chemistry
So I am trying to understand in molecular terms the solubility of NaCl in water. So there are intramolecular forces that are mostly ionic between the ions, creating this partial positive, partial negative substance. And the intermolecular forces are also ionic. Ionic forces ...
Thursday, May 8, 2014 at 7:54pm

Chemistry 104
The voltage generated by the zinc concentration cell described by, Zn(s)|Zn2 (aq, 0.100 M)||Zn2 (aq, ? M)|Zn(s) is 11.0 mV at 25 °C. Calculate the concentration of the Zn2 (aq) ion at the cathode.
Thursday, May 8, 2014 at 7:28pm

chemistry
What is the final temperature when 54g ice at 0oC is mixed with 200g water at 65oC
Thursday, May 8, 2014 at 7:28pm

Chemistry 104
A current of 3.40 A is passed through a Ni(NO3)2 solution for 1.80 hours. How much nickel is plated out of the solution?
Thursday, May 8, 2014 at 7:21pm

Chemistry
Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Cr2 ] = 0.859 M and [Ni2 ] = 0.0190 M. Standard reduction potentials can be found here.
Thursday, May 8, 2014 at 7:18pm

Chemistry
Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Cr2 ] = 0.859 M and [Ni2 ] = 0.0190 M. Standard reduction potentials can be found here.
Thursday, May 8, 2014 at 7:09pm

Chemistry
How many grams of nitrogen are required to react with 2.79g of hydrogen to produce ammonia? A) 25.8 g B) 13.0 g C) 78.2 g D) 38.7 g E) 77.4 g I get the answer as 38.7 but it is meant to be B I did 2.79g x 3molH2/2.016g/mol x 1molN2/3molH2 x 28.02g/mol/1moleN2
Thursday, May 8, 2014 at 6:52pm

Chemistry
What would the potential of a standard hydrogen (S.H.E.) electrode be if it was under the following conditions? [H+] = 0.38 P(H2) = 3.8 T = 298 K
Thursday, May 8, 2014 at 6:18pm

Chemistry
Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Cr2 ] = 0.859 M and [Ni2 ] = 0.0190 M. Standard reduction potentials can be found here. Cr+Ni(2+) ->Cr(2+) + Ni
Thursday, May 8, 2014 at 6:16pm

Chemistry
Calculate the standard free-energy change for the following reaction at 25 °C. Standard reduction potentials can be found here. 2Au(3+) + 3Cr-->2Au+3Cr(2+)
Thursday, May 8, 2014 at 6:15pm

Chemistry 104
A current of 3.40 A is passed through a Ni(NO3)2 solution for 1.80 hours. How much nickel is plated out of the solution?
Thursday, May 8, 2014 at 6:01pm

College Chemistry
1 L of N_2_ gas, having a pressure of 2.5 atm, is added 1 L of Ar gas, having a pressure of 3.7 atm, in a sealed, rigid flask. What is the final pressure in the flask?
Thursday, May 8, 2014 at 5:29pm

Steps in Chemistry
You notice that a lawn looks unhealthy and that, perhaps, the grass is dying. Undertake a scientific project to save the lawn. What is your initial hypothesis? Describe an experiment you can design to test it - include more than 1 step and variables. Hypothesis: “Adding ...
Thursday, May 8, 2014 at 1:07pm

Chemistry
Write the formulas for silicon dioxide. SiO2 so how am i suppose to write formula(s) for it? like how ?
Thursday, May 8, 2014 at 12:53pm

Chemistry
Complete and balance the following equation. Then write it as a net ionic equation. K3PO4(aq) + MgCl2(aq) Umm...help
Thursday, May 8, 2014 at 12:33pm

Chemistry
I need help with Chemistry homework.. I dont know how to write formulas..Please help me! Write the formulas for silicon dioxide.
Thursday, May 8, 2014 at 12:01pm

Chemistry
A solution of 22.0g of nonionic ascorbic acid in 100.0g of water freezes at – 2.33°C. What is the formula weight of the acid?
Thursday, May 8, 2014 at 11:38am

Chemistry
How much heat in kilojoules must be removed from a glass of water that contains 100g of water to lower its temperature from 30 C to 15 C?
Thursday, May 8, 2014 at 11:34am

chemistry
Assume you poured 5.00 g of KOH in 250 mL of pure water. What is the molarity of the solution you made?
Thursday, May 8, 2014 at 10:20am

Chemistry - Science (Dr. Bob222)
Nitrogen gas has values of Cv and Cp of 20.8 and 29.1 J K-1 mol-1, respectively. When a certain amount of nitrogen is heated at constant pressure, what fraction of the heat Q is used to increase the internal energy of the gas, and how is the remaining energy used? A) 3/2 of Q ...
Thursday, May 8, 2014 at 8:44am

Chemistry - Science (Dr. Bob222)
Hydrazine is used as a rocket fuel because its reaction with oxygen is extremely exothermic: N2H4(liquid) + O2(g)  N2(g) + 2H2O(liquid) ΔH(reaction) = -615 kJ mol-1 What is the enthalpy of this reaction if water were produced in the gaseous rather than the liquid ...
Thursday, May 8, 2014 at 8:37am

(12)Chemistry - Science (Dr. Bob222)
Calculate delta E for a process in which 88.0 g of nitrous oxide gas (N2O) is cooled from 165 ˚C to 65 ˚C at a constant pressure of 5.00 atm. The molecular weight of nitrous oxide is 44.02 g/mol, and its heat capacity at constant pressure, Cp, is 38.70 J/molK. A) - ...
Thursday, May 8, 2014 at 7:51am

(23.Chemistry - Science (Dr. Bob222)
An electrochemical battery made from Sn and Cu electrodes under standard conditions shows an initial voltage of V= 1.1 V. If the concentration of both Cu2+ and Sn2+ solutions is increased to 2 M from 1 M, the observed voltage will: (Hint: use the Nernst equation) A. increase ...
Thursday, May 8, 2014 at 7:17am

(19) Chemistry - Science (Dr. Bob222)
Use the following information to answer this question: Cu+(aq) + e- → Cu(s) E° = 0.521V Cu2+ (aq) + e- → Cu+ (aq) E° = 0.153 V. Given these half cell reactions, an aqueous solution of Cu+ ion in the absence of O2(g) : A. will be thermodynamically stable B. ...
Thursday, May 8, 2014 at 7:08am

Chemistry
Calculate molarity of HNO3 please help? Calculate molarity of HNO3 prepared by dissolving 22.3 grams of HNO3 in water to make 875 ml of solution... Please help I'm stuck
Thursday, May 8, 2014 at 3:53am

chemistry
a 2.00 L ballon at 25 degrees celcius and 745mmHg floats on an altitude where the temperature is 10 degrees celcius and the air pressure is 700mmHg. what is the new volume othe balloon
Thursday, May 8, 2014 at 3:53am

Chemistry
Why is the first ionisation energy of chlorine greater than the first ionisation energy of Lithium ?
Thursday, May 8, 2014 at 3:22am

Chemistry
Please Help! Describe how water could be classified as either an acid or a base. Give an example of each (acid and base). What word describes substances that can be classified as acids or bases?
Thursday, May 8, 2014 at 2:02am

Chemistry
You can purchase hydrochloric acid in a concentrated form that is 37.0 hcl by mass and has a density of 1.20g/mL. Describe how exactly you would prepare 2.85 L of 0.500 M HCL from the concentrated solution.
Wednesday, May 7, 2014 at 10:35pm

chemistry
A cylinder contains 40 g of HE, 56 g of N2, and 40 g of Ar. How many moles of each gas are in the mixture?
Wednesday, May 7, 2014 at 9:21pm

chemistry
.256g unknown acid is titrated with .12M NaOH. It requires 34.8ml of base to reach the equivalence point. What is the molar mass of the acid?
Wednesday, May 7, 2014 at 9:18pm

chemistry
20.70 ml of .42 M HClO4 is required to neutralize .966g of an unknown base. Find the molar mass of the base .
Wednesday, May 7, 2014 at 9:16pm

chemistry
18.6 g KOH is neutralized by 58.4 ml of unknown acid find the molarity of the acid.
Wednesday, May 7, 2014 at 9:14pm

(11) Chemistry - Science (Dr. Bob222)
In the following hypothetical reaction A + B → C + D, the equilibrium constant, Keq is less than 1.0 at 25°C and decreases by 35% on changing the temperature to 45°C. What must be true according to this information? A. The ΔH° for the reaction is ...
Wednesday, May 7, 2014 at 7:15pm

Chemistry - Science (Dr. Bob222)
The following reaction has a positive value of ΔG°. 2H2O(g) → 2H2(g) + O2(g) Which of the following statements must be true? A. The reaction is slow. B. The reaction will not occur. That is, when H2O(g) is introduced into a flask, no O2 or H2 will form even over...
Wednesday, May 7, 2014 at 7:04pm

CHEMISTRY HELP !!!!
Al3+ is reduced to Al(s) at an electrode. If a current of 2.75 ampere is passed for 36 hours, what mass of aluminum is deposited at the electrode? Assume 100% current efficiency. a. 9.2 x 10–3 g b. 3.3 x 101 g c. 9.9 x 101 g d. 1.0 x 102 g e. 3.0 x 102 g I think it is ...
Wednesday, May 7, 2014 at 3:46pm

CHEMISTRY HELP !!!!
Complete the following fission reaction 1/0 n + 235/92 U ---> 236/92 Te + _____ +2 (1/2)n a) 97/40 Zr b) 99/40 Zr c) 99/38 Sr d) 95/42 Mo e) 96/41 Y Answer is A or B not sure
Wednesday, May 7, 2014 at 3:41pm

CHEMISTRY HELP !!!!
If a nucleus undergoes beta particle emission a. its atomic number decreases by four and its mass number decreases by two. b. its atomic number decreases by two and its mass number decreases by four. c. its atomic number increases by one and its mass number is unchanged. d. ...
Wednesday, May 7, 2014 at 3:25pm

Chemistry
Consider an aqueous solution that contains 22 % (by mass) of a hypothetical solute Z. The formula weight of the solute Z is 215.2. The density of the solution is observed to be 1.12 g/mL. What is the molarity of Z in this solution? Answer in grams
Wednesday, May 7, 2014 at 3:23pm

Chemistry
Calculate the Molarity of the solution that contains 43.5 grams of K2SO4 in a total volume of 250ml.
Wednesday, May 7, 2014 at 1:04pm

Chemistry
What determines whether one metal will replace another metal from a compound in a single-replacement reaction?
Wednesday, May 7, 2014 at 12:45pm

chemistry
If 15.0 grams of Iron (III) oxide reacts with 25.0 grams of Strontium phosphate, how many grans of Iron (III) phosphate will be produced?
Wednesday, May 7, 2014 at 12:00pm

chemistry
Solution A:50cm^3 of 1.0mol dm^-3 hydrochloric acid,HCl Solution B:10cm^3 of 2.0mol dm^-3 hydrochloric acid,HCl (a)Calculate the number of moles of hydrochloric acid,HCL in each solution. (b)Solution A and B are mixed together. (i)Calculate the number of moles of hydrochloric ...
Wednesday, May 7, 2014 at 11:15am

chemistry
Two solutions were prepared. The first was a 0.672 M solution of aluminum hydroxide and the second was a 0.405 M sulfuric acid solution. 1.) If a total of 500 mL of aluminum hydroxide solution was prepared, how many grams of the solute (AL(OH)3) would have been weighed out in ...
Wednesday, May 7, 2014 at 11:14am

chemistry pls help me asap
100cm^3 of a sodium hydroxide,NaOH solution contains 4.0g of solid sodium hydroxide,NaOH.40 cm^3 of phosphoric acid,H3PO4 is needed to neutralise 40cm^3 of the alkali.(RAM:H,1;O,16;Na,23;P,31) (a)Calculate the molarity of the sodium hydroxide,NaOH solution. (b)Calculate the ...
Wednesday, May 7, 2014 at 11:07am

chemistry
200cm^3 of 1.0 mol dm^-3 sulphuric acid,H2SO4 is poured into a 250 cm^3 volumetric flask.Distilled water is then added to make 250 cm^3 of solution. (a)What is the molarity of the diluted acid solution? (b)What is the volume of 1.6 mol dm^-3 sodium hydroxide,NaOH solution ...
Wednesday, May 7, 2014 at 10:59am

chemistry
A student dissolved 3.65 g of hydrogen chloride gas,HCL in water to make 1.0dm^3 of solution.Calculate the volume of a 0.1 mol dm^-3 barium hydroxide,Ba(OH)2 solution required to completely neutralise 25.0 cm^3 of the acid solution.(RAM:H,1;CL,35.5)
Wednesday, May 7, 2014 at 10:54am

chemistry
The volume of 0.15 mol dm ^-3 sulphuric acid,H2SO4 required to completely neutralise 25.0cm^3 of potassium hydroxide,KOH solution.
Wednesday, May 7, 2014 at 10:50am

Pages: <<Prev | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | Next>>

Post a New Question | Current Questions

Homework Help: Science

Search
Members