A chemist carefully measures the amount of heat needed to raise the temperature of a 674.0 mg sample of a pure substance from -4.0 °C to 4.6 °C. The experiment shows that 0.81 J of heat are needed. What can the chemist report for the specific heat capacity of the substance? Be sure your answer has the correct number of significant digits.

Q: The pH of a solution containing 0,1 M of a weak acid HA is 6. Calculate Ka for this acid. O 1.0 x 10...

A: Let HA is a weak acid whose concentration is 0.1 M and pH is 6 and the dissociation constant is Ka. ...

Q: mass

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A: We first need to determine the limiting reagent. After determining the limiting reagent, we can calc...

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Q: A solution that has a hydrogen ion concentration equal to 3.52 x 10-3 has a pH = _____________?

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Q: Gaseous methane (CH,) reacts with gaseous oxygen gas (o,) to produce gaseous carbon dioxide (co.) an...

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Q: Liquid octane (CH3(CH,) CH;) reacts with gaseous oxygen gas (0,) to produce gaseous carbon dioxide (...

A: Given :-  Mass of Octane, (CH3(CH2)6CH3) (C8H18) = 9.14 g  Mass of Oxygen gas, O2 = 45.4 g  Mass of ...

Q: What amount of heat, in kJ, is required to vaporize 115.00 g of ethanol (C2HSOH)? (AHvap = 43.3 kJ/m...

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Q: This question is based on the five compounds (A-E) given below. (A) CH;-CH=CH, (B) CH;-CHBr-CH2-CH; ...

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Q: The formation of nitrogen monoxide from its elements has an equilibrium which favors reactants: N2 (...

A: Nitrogen reacts with oxygen to form nitrogen oxide. The equation for the balanced chemical reaction ...

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Q: (1] (CH),CCI, AICIh а. [2] KMNO4 b. [1] Br2, hv [2] KOC(CH3)3 [1] C2, FeCl, с. [2] Zn(Hg), HCI NO2 d...

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Q: What gas should we use to separate two compounds with very similar boiling points

A: solution is shown below.

Q: HO H,O OH + [acid or base] OH Acetylsalicylic Acid (aspirin) Salicylic Acid CH,OH ,A H,SO, (conc.)] ...

A: .

Q: The decomposition of ammonia is zero order process is with a half-life of 28.3 seconds at a certain ...

A: Given, The decomposition of ammonia is zero order reaction. Half Life (t1/2) = 28.3 s Rate constant ...

Q: Gaseous methane (CH,) reacts with gaseous oxygen gas (0,) to produce gaseous carbon dioxide (Co,) an...

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Q: The following reaction is first order in N2O5N2O5: N2O5(g)→NO3(g)+NO2(g)N2O5(g)→NO3(g)+NO2(g) The ...

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Q: What volume of 0.5 M NaOH is required to react completely with 25.0 mL of 1.0 M H2CO3? Assume the re...

A: Given that,  Molarity of NaOH (M1) = 0.5 M  Molarity of H2CO3 (M2) = 1.0 M  Volume of H2CO3 (V2) = 2...

Q: A raindrop has a mass of 50. mg and the Pacific Ocean has a mass of 7.08 x 100 kg. Use this informat...

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Q: Measurements show that the enthalpy of a mixture of gaseous reactants decreases by 225. kJ during a ...

A: a.) To Calculate the change in energy of the gas mixture , we would use first law of thermodynamics....

Q: How much MgCl, must you dissolve in water to prepare 20 mL of a 2.0 M solution?

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Q: Calucate the atomic mass: Titanium: Ti-46 (7.9 %), Ti-47 (7.3 %), Ti-48 (73.9 %), Ti-49 (5.5 %), Ti-...

A: Given data : Ti-46 = 7.9 % Ti-47 = 7.3 % Ti-48 = 73.9 % Ti-49 = 5.5 % Ti-50 = 5.4 %

Q: here are 7.62 x 1015 metric tons (T) of nitrogen in the atmosphere (1 metric ton = 1000kg). How...

A: Solution - According to the question - 1 metric ton = 1000kg 1 kg = 2.20 lb 1 metric tons = 1000 * 2...

Q: What mass (in grams) of sodium acetate (MM=0.82 g/mol) is needed to prepare 500 ml of 75 mM acetate ...

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Q: Gaseous ethane (CH,CH,) reacts with gaseous oxygen gas (0,) to produce gaseous carbon dioxide (CO,) ...

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Q: Fou m Costants 12 C he llown Sreactions and correponding equilibenum constants Reaction A K-1) React...

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Q: Liquid hexane (CH; (CH,),CH;) reacts with gaseous oxygen gas (02) to produce gaseous carbon dioxide ...

A: Weight of hexane = 20.7 gm Weight of O2 = 67.9 gm  

Q: Is there a difference when the needle or metal clip is placed on the surface of distilled water and ...

A: Yes, there is a difference when the needle or metal clip is placed on the surface of distilled water...

Q: mol

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Q: Determine the heat associated with a decrease in the temperature of 375g of water from 31.5°C to 24....

A: Heat associated with decreasing temperature is calculated using the equation,                       ...

Q: 1. A 55.0 ml sample of 0.102 M potassium sulfate is mixed with excess lead (II) acetate to produce p...

A: Potassium sulfate reacts with lead(II) acetate to form potassium acetate and lead(II) sulfate. The e...

Q: A 75.0 mL sample of 0.05 M HCN (pKa = 9.21) is titrated with 0.5 M NAOH. What is [H3O*] in the solut...

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Q: 1.0 x 10-11 moles of HCl are added to 1.OL of H20. What is the pH? О 3.0 O 10.0 O 11.0 О 1.0 O 7.0

A: Moles of HCl = 1.0 × 10-11 moles Volume of water = 1.0 Liter

Q: Determine the molecular formula of the compound with an empirical formula of CH and a molar mass of ...

A: Given:- Determine the molecular formula of the compound with an empirical formula of CH and a molar ...

Q: Determine the rate law for the production of nitrosyl fluoride (NO2F) that occurs according to the f...

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Q: Phosphorus trichloride and chlorine gas react to form phosphorus pentachloride: PCh (g) + Cl, (R) O ...

A: Using ICE table   PCl3 Cl2 PCl5 Initial 1.0 M 2.0 M 0 Change x x x Equilibrium 1.0 -x 2...

Q: Give the reaction mechanism of the given chemical reaction (synthesis of methyl salicylate)

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Q: Consider the reaction, N204(g) = 2 NO2(g) where the value for Ke is 1.7 x 10-6. The initial concentr...

A: Given Reaction:-  N2O4(g)  <------> 2NO2(g)  Kc =  1.7 × 10-6  

Q: When the entropy change of the surroundings is negative, the enthalpy change for system O will be ne...

A: A multiple choice question based on chemical thermodynamics that is to be accomplished.

Q: What volume of 12 M HCI is required to prepare 16 L of 0.25 M HCI? 250 mL 333 mL 768 mL 585 mL O 130...

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Q: The following molarities were calculated from replicate standardization of a solution: 0.5006, 0.500...

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Q: HNO3 H2SO4 `NO2 а. но b. AICI3 CI С. H. Br2 FeBr3

A: Given all reactions are electrophilic aromatic substitution reactions. In electrophilic aromatic sub...

Q: Charles's Law 200 00 025 ノ-00 1-25 -50 Volume (liters) B Write an equatiun f the line Shoun in the a...

A: Charles law states that at constant pressure, volume is directly proportional to temperature. Let us...

Q: A mixture of krypton and oxygen gas is expanded from a volume of 31.0L to a volume of 95.0 L, while ...

A: Given :- External pressure Pext = 71.0 atm Initial Volume Vi = 31.0 L Final Volume Vf = 95.0 L

Q: A mixture of helium and oxygen gas is expanded from a volume of 10.0 L to a volume of 75.0 L, while ...

A: Given that, V1= 10.0 L V2=75.0 L  Pext.=85.0 atm  Work done w= ?

Q: Aqueous hydrobromic acid (HBr) reacts with solid sodium hydroxide (NaOH) to produce aqueous sodium b...

A: The given data is as follows: The mass of sodium bromide produced = 1.68 g The mass of hydrobromic a...

Q: The elementary reaction 2 NO2 (g) → N2O4 (g) is an example of a/an elementary step. (A) (B) Bimolecu...

A: The elementary reactions are those in which only one reactant reacts to give the product. Like -    ...

Q: What is the pH of a solution containing 0.57 mol L-1 of a diprotic acid with pKA1 = 5.36 and pKA2 = ...

A: Answer: 2.80

Q: Give a reaction equation you could use to prepare an alkylamine from 2-phenyl-pentanoylazide. Show t...

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