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November 29, 2014

Homework Help: Science: Chemistry

Recent Homework Questions About Chemistry

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chemistry
A student obtained an average PV value of 42,000 in column (f) of the data table. If the syringe had been able to be adjusted to a volume of 35.0 mL, what would the pressure be inside the flask?
Wednesday, November 5, 2014 at 2:32pm

chemistry
Calculate the percent deviation from ideal behavior for 0.85 mol of CO2 gas in a 1.20 L container at 45.0°C, which exerts a pressure of 19.2 atm.
Wednesday, November 5, 2014 at 2:00pm

science, chemistry
OBJECTIVE: to find out which of two indicators, methyl orange or phenolphthalein, gives more reliable and consistent results in the titration of H3PO4 with NaOH. REQUIREMENT: (1). Phosphoric acid solution of unknown concentration. (2). Standard NaOH solution. (3). Methyl ...
Wednesday, November 5, 2014 at 12:53pm

Chemistry
Cs(s)+H2O(l)→ ? i thought it was H2+CsOH but the computer says that's wrong.
Wednesday, November 5, 2014 at 12:38pm

chemistry
A weather balloon is filled with 0.295 m3 of helium on the ground at 18 °C and 756 torr. What will the volume of the balloon be at an altitude of 10 km where the temperature is 48 °C and the pressure is 0.14 atm?
Wednesday, November 5, 2014 at 11:16am

chemistry
what is the procedure for determining the boiling point of 1 M solution of sugar,urea,glucose,NaCl,BaCl2,AlCl3
Wednesday, November 5, 2014 at 6:43am

Chemistry please help
A 1.516 M soltion is made by dissolving 1.570 g of the compound in 0.2238 mol of water. Determine the molar mass and apparent molecular formula of the compound.
Wednesday, November 5, 2014 at 6:08am

Chemistry
A sample of light has a wavelength of 2.61 x 10^-12 m. What is it's frequency? A popular radio station broadcasts with a frequency of 94.7 mHz. What is the wave length of the broadcast? (1MHz = 1 x10^6 HZ) What is the wavelength of electromagnetic radiation having a ...
Tuesday, November 4, 2014 at 10:14pm

Chemistry
A piece of copper of mass 21.3 g at 106.0 °C is placed in a vessel of negligible heat capacity but containing 53.0 g of water at 19.3 °C. Calculate the final temperature of the water. I keep getting 22 celsius and I'm not sure where I'm going wrong. I plug it ...
Tuesday, November 4, 2014 at 10:08pm

Chemistry
If 0.85 mol of a diatomic molecule has a mass of 23.8g, identify the molecule? We tried to multiply .85 mol and 23.8g and then multiply by 2 to get an answer, but I believe I might be heading in the wrong direction.
Tuesday, November 4, 2014 at 9:48pm

Chemistry
I am a parent trying to help with my childs homework. This is the question that has us stuck. Can you assist us? Boron trioxide B203 , reacts with waterto produce boric acid, B(OH)3. B2O3(s) + 3H2o (l) -> 2B(OH)3(s) Ricardo adds 27.2 g of B2O3 to an excess of h2O, and the ...
Tuesday, November 4, 2014 at 8:44pm

chemistry
0.688 g of antacid was treated with 50.00 mL of 0.100 M HCl. The excess acid required 4.21 mL of 1.200 M NaOH for back titration. What is the neutralizing power of this antacid expressed as mmol(millimoles) of HCl per gram of antacid?
Tuesday, November 4, 2014 at 8:19pm

chemistry
Draw the dominant Lewis structure for NO2+. Note, that this ion is isoelectronic with CO2. How many double bonds does this resonance structures have?
Tuesday, November 4, 2014 at 7:08pm

chemistry
Draw one of the Lewis structure of the N2O5. In each case one oxygen bridges the nitrogens (N-O-N single bond) and 2 other oxygens are bonded to each N. How many equivalent resonance structures are there that satisfy the octet rule and where O makes at most 2 bonds?
Tuesday, November 4, 2014 at 7:00pm

Chemistry
How many resonance structures do these following acids have? H2CO3-carbonic acid H3PO4-phosphoric acid H2SO4-sulfuric acid HNO3-nitric acid CH3COOH- acetic acid CH2ClCOOH- chloroacetic acid CHCl2COOH- dichloroacetic acid CCl3COOH- trichloroacetic acid
Tuesday, November 4, 2014 at 6:55pm

Chemistry
2 moles of ideal gas at 300K, initial volume 25 L, are compressed under an external pressure at 3600 torr. Assuming the temp and the internal energy of gas do not change, what is the entropy change of the gas? (Assume the heat flow is reversible)
Tuesday, November 4, 2014 at 6:52pm

Chemistry
What is the pH of a solution prepared by mixing 25.00 mL of 0.10 M CH3CO2H with 25.00 mL of 0.010 M CH3CO2Na? Assume the volumes of the solution are additive and that Ka = 1.8 x 10-5 for CH3CO2H. 4. How is this solved?
Tuesday, November 4, 2014 at 6:30pm

chemistry
How many atoms of oxygen are there in 5.00g of copper(II) sulfate pentahydrate?
Tuesday, November 4, 2014 at 5:53pm

Chemistry
A 1.516 M solution is made by dissolving 1.570 g of the compound in 0.2238 mol of water. Determine the molar mass and apparent molecular formula of the compound.
Tuesday, November 4, 2014 at 5:49pm

Chemistry pretty urgent!!!!!!!
Chemical bonding question! The partial Lewis structure that follows (Figure 1) is for a hydrocarbon molecule. In the full Lewis structure, each carbon atom satisfies the octet rule, and there are no unshared electron pairs in the molecule. The carbon-carbon bonds are labeled 1...
Tuesday, November 4, 2014 at 4:58pm

Chemistry
Information: Original temp of HCl: 23.3C of NaOH: 23.8C Final temp of the mixture: 36.7C I am to find qH2O (assume 50 mL of solution and use average density of 1.02 g/mL) but I'm a bit lost. I also need to find /\H and /\H per mole of H+a and OH- ions reacting, but I ...
Tuesday, November 4, 2014 at 4:13pm

chemistry
A buffer with a pH of 3.93 contains 0.17 M of sodium benzoate and 0.32 M of benzoic acid. What is the concentration of [H ] in the solution after the addition of 0.054 mol of HCl to a final volume of 1.5 L?
Tuesday, November 4, 2014 at 1:36pm

Chemistry
How do we use 2 indicators to confirm the pH of a solution?
Tuesday, November 4, 2014 at 12:59pm

chemistry
In a titration, NaOH was added to a burette. The initial reading was 1.2 ml. At the end of the titration, the final reading was 24.8 ml. What was the volume of NaOH that was added?
Tuesday, November 4, 2014 at 12:37pm

Chemistry
How many mL of 0.122 M Na2CO3 would be needed to precipitate all of the copper ions in 23.7 mL of 0.167 M CuSO4? How many grams of CuCO3 could be recovered?
Tuesday, November 4, 2014 at 12:05pm

chemistry
The pH difference across the membrane of a glass electrode is 2.49. How much voltage is generated by the pH gradient at: 25C? 37C?
Tuesday, November 4, 2014 at 1:59am

organic chemistry laboratory
hi, im not sure if all my answers are correct especially number 5. could any one check and tell me? please and thank you. 1. Why is it important to have clean test tubes before running a test? Before which tests should acetone not be used to clean the test tubes? Due to ...
Tuesday, November 4, 2014 at 12:44am

chemistry
We only can make ozone layer by adding 3 oxygen atoms or we cannot
Tuesday, November 4, 2014 at 12:05am

chemistry
Propose methods for protecting the sodium hydroxide solution in the bottle and the buret from exposure to carbon dioxide in the air.
Monday, November 3, 2014 at 11:49pm

Chemistry Lab
If 3.5 mL of distilled water is added to 1.5mL of a 0.150 M solution of CoCl2, what is the concentration of the resulting solution? M1V1=M2V2 M1= 0.150 V1= 1.5mL M2= 3.5?
Monday, November 3, 2014 at 11:37pm

chemistry
What is w when 3.37 kg of H2O(l), initially at 25.0oC, is converted into water vapour at 111oC against a constant external pressure of 1.00 atm? Assume that the vapour behaves ideally and that the density of liquid water is 1.00 g/mL. (Remember to include a "+" or &...
Monday, November 3, 2014 at 11:35pm

chemistry
The enthalpy change for the reaction below at 25oC is -2,252 kJ (per mole of C11H24). What is the internal energy change for the reaction at 25oC? 11 CO(g) + 23 H2(g) --> C11H24(l) + 11 H2O(l)
Monday, November 3, 2014 at 11:18pm

Chemistry
Calculate the volume of 1.00 M acetic acid solution and mass of sodium acetate needed to make 250 mL of a 0.450 M acetic acid/acetate buffer solution with a pH of 4.00. (The pKa is 4.74 for acetic acid) *Please explain it in detail, dont leave a step out! Thank You!
Monday, November 3, 2014 at 10:42pm

chemistry
Bringing the real world law into video games could hold various complications. The possible complications outweigh the penitence driven into the prosecuted youngsters for their time wrongdoing. Laws in the real world should be separate from the rules governing an individual&#...
Monday, November 3, 2014 at 10:19pm

Organic Chemistry
Hi, I did an extraction experiment. I've got my basic layer, and getting my acidic salt in return. To do this, I am instructed to first "add a small amount of NaCl to help with the product precipitation". Then, again I am instructed to add HCl to "acidify&...
Monday, November 3, 2014 at 10:13pm

chemistry
A 0.009298-mol sample of an organic compound was burned in oxygen in a bomb calorimeter. The temperature of the calorimeter increased from 23.7oC to 27.1oC. If the heat capacity of the calorimeter is 4.84 kJ (oC)-1, then what is the constant volume heat of combustion of this ...
Monday, November 3, 2014 at 9:19pm

Chemistry
Calculate the mass of sugar, C12H22O11, in 280.4 mL of a 1.49 M solution of sugar. (atomic weights: C = 12.01, H = 1.008, O = 16.00)
Monday, November 3, 2014 at 7:30pm

Chemistry
What volume (in milliliters) of 0.355 M aqueous ammonia, NH3, could be made from 19.9 mL of concentrated aqueous ammonia (15.0 M)? (atomic masses: N = 14.01, H = 1.008)
Monday, November 3, 2014 at 7:29pm

Chemistry
Household ammonia contains 0.85 g of NH3 in each 100. mL of solution. What is the molarity of the ammonia solution? (atomic masses: N = 14.01, H = 1.008)
Monday, November 3, 2014 at 7:28pm

Chemistry
What mass of sodium chloride, NaCl, is needed to make 369. g of a 3.04%(m/m) NaCl solution? (atomic masses: Na = 22.99, Cl = 35.45)
Monday, November 3, 2014 at 7:28pm

Chemistry
The ionic compund sometimes called yellow uranium is used to produce colored glazes for ceramics. It is 7.252% sodium, 75.084% uranium, and 17.664% oxygen a. What is the empirical formula for this compound? b. This compound has a molecular mass of 1268.06 g/mol, what is the ...
Monday, November 3, 2014 at 7:14pm

chemistry
50 mL of water at 48.9EC were mixed with 50 mL of water at 23.8EC in a calorimeter also at 23.8EC. The final temperature was 33.1EC. Assuming that neither the density of water nor its specific heat capacity change with temperature, calculate the total heat capacity of the ...
Monday, November 3, 2014 at 6:33pm

chemistry
Calculate the volume of 1.00 M acetic acid solution and mass of sodium acetate needed to make 250 mL of a 0.450 M acetic acid/acetate buffer solution with a pH of 4.00. (The pKa is 4.74 for acetic acid).
Monday, November 3, 2014 at 6:11pm

chemistry
What type of reaction would CO2 + H2O --> H2CO3 be I think it would be synthesis reaction?
Monday, November 3, 2014 at 5:57pm

chemistry
Not sure how to complete this chemical reaction: Li + Fe(NO3)3 --->
Monday, November 3, 2014 at 5:44pm

chemistry
Complete and balance the following reactions, where applicable. If no reaction occurs, write N.R. Li + H2O ---> KCI + F2 ---> Au + HNO3 ----> CI2 + NaF ---> Li + Fe(NO3)3 --->
Monday, November 3, 2014 at 5:06pm

Chemistry
A concentration cell consists of two Sn/Sn2+ half-cells. The cell has a potential of 0.12V at 25 ∘C. What is the ratio of the Sn2+ concentrations in the two half-cells?
Monday, November 3, 2014 at 3:32pm

chemistry
How many Milliliters of 3.50 M HCl (aq)are required to react 5.75g of Zn(s)?
Monday, November 3, 2014 at 3:00pm

Chemistry
For a particular isomer of C8H18, the following reaction produces 5099.5 kJ of heat per mole of C8H18(g) consumed, under standard conditions. What is the standard enthalpy of formation of this isomer of C8H18(g)?
Monday, November 3, 2014 at 2:37pm

chemistry
What is the correct formula for calcium nitrate
Monday, November 3, 2014 at 1:04pm

chemistry
how many moles of no2 remain when 2.5 moles of n205 completely react
Monday, November 3, 2014 at 12:48pm

chemistry
ow many grams of aluminum chloride must decompose to produce 78.3 milliliters of aluminum metal, if the density of aluminum is 2.70 g/mL? Show all steps of your calculation as well as the final answer. (5 points) AlCl3 → Al + Cl2
Monday, November 3, 2014 at 12:29pm

chemistry
A chemist wants to make 5.50 L of a 0.300 M lithium phosphate solution. What mass of lithium phosphate must be used to make this solution?
Monday, November 3, 2014 at 9:16am

Chemistry
If the density of ethyl alcohol is 0.789 g/mL, how many quarts can be produced by the fermentation of 100.0 lb of sugar?
Monday, November 3, 2014 at 2:50am

chemistry
Cloves contain two principal essential oils, caryophyllene and eugenol. A student carrying out a steam distillation using cloves obtained a mixture of these two oils in the distillate. Explain how the student could separate and isolate the two essential oils using liquid-...
Monday, November 3, 2014 at 2:31am

chemistry
Limone (MW 136g/mol) is a pleasant smelling liquid found in lemon and orange peels. The boiling point of limonene is 175 ˚C, but it co-distills with water at 97.5 ˚C. If the vapour pressure of water at 97.5˚C is 690 mmHg, what percent (by mass) of the steam-...
Monday, November 3, 2014 at 1:31am

chemistry
How many grams of CO2(g) are there in 81.0mL of the gas at 0.789atm and 30 ∘C?
Monday, November 3, 2014 at 12:11am

Chemistry
It takes 49.0J to raise the temperature of an 8.80g piece of unknown metal from 13.0∘C to 24.7∘C. What is the specific heat for the metal?
Monday, November 3, 2014 at 12:02am

CHEMISTRY
hOW TO PREPARE HCL SOLUTION OF 5-7 pH.
Sunday, November 2, 2014 at 11:59pm

Chemistry
How much energy (in kilojoules) is required to convert 130mL of diethyl ether at its boiling point from liquid to vapor if its density is 0.7138 g/mL?
Sunday, November 2, 2014 at 11:42pm

chemistry
Aniline (MW93 g/mol) co-distills with water 98.2 C. The vapor pressure of water at 98.2 C is 717 mmHg. You need to isolate 10 g of aniline. What is the minimum volume of water required to isolate 10 g of aniline in a steam distillation at 760 mmHg?
Sunday, November 2, 2014 at 10:37pm

Chemistry
A certain indicator, HA, has a Ka value of 6.3 × 10-8. The protonated form of the indicator is blue and the ionized form is red. -What is the PKa of the indicator? -What is the color of the indicator in a solution with pH=5?
Sunday, November 2, 2014 at 10:24pm

Chemistry
A generic solid, X, has a molar mass of 77.7 g/mol. In a constant-pressure calorimeter, 31.2 g of X is dissolved in 289 g of water at 23.00 °C. The temperature of the resulting solution rises to 24.40 °C. Assume the solution has the same specific heat as water, 4.184 J...
Sunday, November 2, 2014 at 9:52pm

chemistry
Calculate the potential of the following two half-cells that are connected by a salt bridge: a galvanic cell consisting of a standard hydrogen electrode on the left and a platinum electrode immersed in a solution that is 3.50 3 1023 M in TiO21, 0.07000 M in Ti31, and buffered ...
Sunday, November 2, 2014 at 9:37pm

chemistry
The reaction between sodium hydroxide and hydrobromic acid is represented in the equation below: OH- + H+ -> H2O A 62.5 mL sample of 1.86 M NaOH at 22.5 deg Celsius was mixed with 62.5 mL sample of 1.86 M of HBr at 22.5 deg Celsius in a coffee cup calorimeter. The ...
Sunday, November 2, 2014 at 9:13pm

Chemistry
If vinegar sample #1 requires 29.05 mL of NaOH solution to reach an endpoint, what volume should be required for samples #2 and #3?
Sunday, November 2, 2014 at 9:08pm

chemistry
Which of the following reactions have a positive ÄSrxn? Check all that apply. A(g) + B(g)--> C(g) 2A(g) + B(g)--> 4C(g) A(s) + B(g)--> 2C(g) 2A(g) + 2B(g)--> 3C(g)
Sunday, November 2, 2014 at 8:44pm

chemistry
Calculate the Calorimeter Constant (Ccal) if 25.00 g of water at 50.21°C was added to 25.00 g of water at 25.00 °C, resulting in an equilibrium temperature of 35.00 °C?
Sunday, November 2, 2014 at 8:32pm

Chemistry
Which of the following reactions have a positive ÄSrxn? Check all that apply. A(g) + B(g)--> C(g) 2A(g) + B(g)--> 4C(g) A(s) + B(g)--> 2C(g) 2A(g) + 2B(g)--> 3C(g)
Sunday, November 2, 2014 at 8:25pm

chemistry
Which of the following reactions have a positive ÄSrxn? Check all that apply. A(g) + B(g)--> C(g) 2A(g) + B(g)--> 4C(g) A(s) + B(g)--> 2C(g) 2A(g) + 2B(g)--> 3C(g)
Sunday, November 2, 2014 at 8:23pm

chemistry
determine the percent yield when 5.00g benzene burns in oxygen gas to form 1.50g of carbon dioxide and water vapor.
Sunday, November 2, 2014 at 7:41pm

chemistry - DrBob?
Hi! Can you tell me if I chose the right options for my chemistry homework? My answers are at the bottom. 1. Electrostatic interaction is important for which type of bond? A. ionic bond B. triple covalent bond C. single covalent bond D. double covalent bond 2. When an atom ...
Sunday, November 2, 2014 at 6:42pm

chemistry
calculate the volume of 0.0321M NaOH that will be required to neutralize 25.00 mL of a 0.0399M hydrochloric acid solution. M1v1=m2v2 since were trying to find out the volume I would change the equation to m2 times V2 divided by M1 0.0399 X 0.025/0.0321 =0.031L I don't know...
Sunday, November 2, 2014 at 6:06pm

chemistry - instrumentation
What can account for differences in the calculated value of a drug concentration in a sample as determined by standard curve method and response factor method?
Sunday, November 2, 2014 at 5:50pm

chemistry
Complete and balance the following reactions, where applicable. If no reaction occurs, write N.R. Li + H2O ----> KCI + F2 ---> Au + HNO3 ---> CI2 + NaF ----> Li + Fe(NO3)3 --->
Sunday, November 2, 2014 at 5:48pm

organic chemistry laboratory
hi, im not sure if all my answers are correct especially number 5. could any one check and tell me? please and thank you. 1. Why is it important to have clean test tubes before running a test? Before which tests should acetone not be used to clean the test tubes? Due to ...
Sunday, November 2, 2014 at 5:13pm

Chemistry
Hi! Can you tell me if I chose the right options for my chemistry homework? My answers are at the bottom. 1. Electrostatic interaction is important for which type of bond? A. ionic bond B. triple covalent bond C. single covalent bond D. double covalent bond 2. When an atom ...
Sunday, November 2, 2014 at 5:11pm

chemistry
find the temperature increase in C expected for 1.00 L of water when it absorbs all of the energy from the combustion of 1.00 g of acetylene, C2H2(g). (Every mole of acetylene releases 1300KJ of energy when combusted)
Sunday, November 2, 2014 at 4:53pm

chemistry
Nitrogen dioxide abstracts with water vapor to produce oxygen and ammonia gas. If 12.8 grams of nitrogen dioxide reacts with 5.00 liter of water vapor at 375 degrees celisus and 725 tore, how many grams of ammonia can be produced? Use an ice table.
Sunday, November 2, 2014 at 4:13pm

chemistry
The mole fraction of neon in the air is about .0000026. If the average molar mass of air is 28.96 g/mol, what is the concentration of neon in air in ppm? How do you set this up?
Sunday, November 2, 2014 at 4:11pm

College chemistry
How much heat is transferred when freezing 520 grams of water at 0 degrees Celsius?
Sunday, November 2, 2014 at 1:33pm

chemistry
At 23 oC the solubility of a gas sample is 0.05 g/L in water at 1.0 atm. What is the solubility when the pressure increases to 2.0 atm? I don't know what formula to use for this question.
Sunday, November 2, 2014 at 1:26pm

Chemistry
If ununseptium (element 117) reacts with oxygen what would be equation of the product? Thanks so much!
Sunday, November 2, 2014 at 1:06pm

Chemistry
Find the mass of each of the following: (a) 5.52 L O2 at 1.89 atm and 250.0 K (b) 3.43 L NH3 at 0.911 atm and 27°C (c) 117 mL SO2 at 0.823 atm and -53°C
Sunday, November 2, 2014 at 12:49pm

chemistry
What is the eq.wt of C7H6O3 and why ??😊
Sunday, November 2, 2014 at 12:48pm

Chemistry
A sample of oxygen that occupies 1.00 x 10^6 mL at 575 mm Hg is subjected to a pressure of 1.20 atm. What will the final volume of the sample be if the temperature is held constant?
Sunday, November 2, 2014 at 12:45pm

Chemistry
How do I find the number of energy levels in a positive and a negative ion? And also how do I find the number of electrons in a ion and a atom?
Sunday, November 2, 2014 at 12:39pm

chemistry
give the specific heat for aluminum is 0.900 J/g*c how much energy is required to raise 25.0 g of aluminum from 20.0 to 75.0
Sunday, November 2, 2014 at 11:36am

chemistry
lithium oxide is an effective absorber of carbon dioxide and can be used to purify air in confined areas such as space vehicles. what volume of carbon dioxide can be absorbed by 1.00 kg of lithium oxide at 25 degrees C and 1.00atm? Li2O(aq) +CO2(g) -> Li2Co3(s)
Sunday, November 2, 2014 at 10:07am

chemistry
how many milliliters of10.0m Hc(aq) are needed to prepare 890.0 ml of 1.00m Hcl(aq)
Sunday, November 2, 2014 at 10:06am

chemistry
Given the following reactions Fe2O3(s) + 3CO (s) → 2Fe (s) + 3CO2(g)ΔH =-28.0 kJ 3Fe (s) + 4CO2(s) → 4CO (g) +Fe3O4(s) ΔH = +12.5 kJ the enthalpy of the reaction of Fe2O3 with CO 3Fe2O3(s) + CO (g) → CO2(g) + 2Fe3O4(s) is __________ kJ
Sunday, November 2, 2014 at 9:37am

chemistry
The value of ΔH° for the reaction below is - 6535 kJ. __________ kJ of heat are released in the combustion of 16.0 g of C6H6(l)? 2C6H6(l) + 15O2(g) → 12CO2(g) + 6H2O (l)
Sunday, November 2, 2014 at 9:34am

chemistry
What is the eq.wt of C7H6O3 and why ??😊
Sunday, November 2, 2014 at 9:25am

Chemistry- Reacting Masses Calculations
Hi the question asks me to calculate the mass of calcium carbonate that must be decomposed to produce 14kg of calcium oxide. I think I've gone wrong somewhere, do you write 14000g or 14kg etc, could you help? I did: Moles CaO=(Mass CaO/Mr CaO) =1400/56 =25 CaO:CaCO3 1:1 25...
Sunday, November 2, 2014 at 6:38am

chemistry
If you dissolve 236.5 g of (NH4)3PO4 and 166.9 g of K3PO4 in enough water to make the volume of the solution 505.0 mL What is the molarity of ammonium ions and phosphate ions?
Sunday, November 2, 2014 at 12:49am

Clinical Chemistry
I am not sure how to start this. You are given a 200% solution of a compound. You must dilute and construct a calibration curve to interpret concentration of compound in unknown samples. Show the steps needed to perform a two-fold serial dilution through 5 tubes.
Sunday, November 2, 2014 at 12:47am

chemistry
The value of ΔH° for the reaction below is -1107 kJ: 2Ba (s) + O2(g) → 2BaO (s) How many kJ of heat are released when 5.75 g of Ba (s) reacts completely with oxygen to form BaO (s)?
Saturday, November 1, 2014 at 11:19pm

chemistry
magnesium metal (1.00 mol) and a volume of aqueous hydrochloric acid that contains .500 mol of HCL are combined and react to completion. how many liters of hydrogen gas, measured at STP, are produced? Mg(s) + 2HCL(aq) -> MgCl2(aq) + H2(g)
Saturday, November 1, 2014 at 10:29pm

Chemistry
If a calorimeter has a mass of 6.0 g, a specific heat of 2.0 J/(g*C), and it and its contents undergo a temperature increase of 5.5 *C, how much heat is gained by the calorimeter?
Saturday, November 1, 2014 at 9:19pm

chemistry
Ima Chemist found the density of Freon-11 (CFCl3) to be 5.58 g/L under her experimental conditions. Her measurements showed that the density of an unknown gas was 4.38 g/L under the same conditions. What is the molar mass of the unknown?
Saturday, November 1, 2014 at 9:13pm

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