04/07/20

A 34.07 g sample of a substance is initially at 27.4 ° C.
A 34.07 g sample of a substance is initially at 27.4 °C. After absorbing 1375 J of heat, the temperature of the substance is 181.0 °C. What is the specific heat (c) of the substance?
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04/07/20

When 0.782g of sodium metal is added to an excess of hydrochloric acid,

When 0.782 g of sodium metal is added to an excess of hydrochloric acid, 8130 J of heat are produced. What is the enthalpy of the reaction as written?
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04/07/20

Chemistry question!! Don't understand

The molar solubility of chromium(III) fluoride is 1.3 x 10^{-3} M. What is the Ksp for this compound?I tried attempting this problem but don't understand what information to take out from the... more
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04/07/20

I tried this question twice got different answers (Chemistry question)!
A 25.0-mL sample of 1.00 M HF is titrated with 0.50 M NaOH. Calculate the pH of the solution after 25.0 mL of NaOH is added. (Ka for HF is 7.2x10^-4)First time i got 0.60 (knew it was wrong)Then i... more
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04/07/20

Chemistry question
A hot air balloon is filled with 1.35 × 10^6L of an ideal gas on a cool morning (11∘ C ) . The air is heated to 107∘C . What is the volume of the air in the balloon after it is heated? Assume that... more
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04/07/20

How many mL of 0.300 M NaF would be required to make a 0.0400 M solution of NaF when diluted to 250.0 mL with water?
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04/07/20

chemistry question
Given the following equation, which is the correct form of the conversion factor needed to convert the number of moles of O2 to the number of moles of Fe2O3 produced?           4Fe + 3O2 → 2Fe2O3
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04/07/20

chemistry question

Water has a specific heat of 1.00 cal/g°C and wood has a specific heat of 0.10 cal/g°C. Which substance requires more heat to be warmed from room temperature to 50°?A.  They both require the same... more
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04/07/20

Cooling/Heating Pad Chemistry Question
Hi I need help with someone to check if I have solved the following correctly :) Thanks in advanceQuestionAn cooling pad or heating pad in "pocket format" can conceivably consist of a plastic bag... more
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04/07/20

Chemistry buffer question!
What is the pH of the buffer that results when 12 g sodium formate (NaHCO2) is mixed with 250 mL of 0.50 M formic acid (HCO2H) and diluted with water to 1.0 L? (Kaof HCO2H = 1.8e10-4)Molar mass... more
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04/07/20

chem question need help solving
What is the pH of a solution that results from diluting 0.50 mol formic acid (HCO2H) and 0.10 mol sodium formate (NaHCO2) with water to a volume of 1.0 L? (Ka of HCO2H = 1.8e10-4)H = 1.810-4
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04/07/20

Need help w/Chemistry question about titrations and pH!
A volume of 25.0 mL of 0.100 M CH3CO2H(aq) is titrated with 0.100 M NaOH(aq). What is the pH after the addition of 12.5 mL of NaOH? Ka for CH3CO2H = 1.8e10-5
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04/07/20

Buffer Solutions Expected pH
Calculate of the expected pH of the solution in beaker 3 after the addition of 20 mL of 1.0 M HCl.Beaker 3 volume: 100mLBeaker 3 (1.0M CH3CO2H & 1.0M NaCH3CO2) pH init: 4.73Breaker 3 (1.0M... more
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04/07/20

Need help with an Chemistry question

What is the energy change when the temperature of 14.2 grams of solid copper is decreased from 39.1 °C to 20.5 °C . what do I do first ? I have to teach myself cause of the virus
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04/06/20

Which equation represents the change a strontium (Sr) atom will undergo to obtain a Nobel gas configuration?
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04/06/20

Determine the theoretical yield of aspirin in grams. Show all mathematical work

Mass of aspirin 2.357g mass of salicylic acid 2.027g
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04/06/20

Chemistry solution

What mass, in grams, of sodium sulfate (Na2SO4) is needed to make 275 g of a 1.5% (m/m) aqueous solution of sodium sulfate?
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04/06/20

Satisfying Octet Rule?
Draw Lewis structures for the following compounds/ions.Decide if the compound/ion listed can satisfy the octet rule (duet rule for H), if so choose Satisfies Octet Rule from the drop down menu.If... more
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04/06/20

Gas Volume Calculations
Indoor space dimensions:Length: 10 m; width: 8 m; height: 4 m.Carbon monoxide (CO) concentration: 45 ppm. 1 m3 =1,000 liters;MW(CO) : 28 g/mol Calculate (only to one decimal):Find:1. Total volume... more
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04/06/20

When 4.00 g Fe and 8.00 g Cl2 react to form FeCl3, the Fe is the limiting reactant and the Cl2 is the excess reactant. What mass of Cl2 remains once the reaction stops? 2Fe + 3Cl2 → 2FeCl3
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04/06/20

If 4.8 mol of CH4 fills a volume of 2.5 L, how many moles would be needed to fill a container with a volume of 4.3L?
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04/06/20

If 0.89 mol of O2 has a volume of 25.0 L at a constant temperature and pressure, what would be the volume of 1.455 mol of O2?
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04/06/20

If 0.357 mol N2 has a volume of 9.2 L at some temperature and pressure, what volume would 0.845 mol N2 have at the same temperature and pressure?
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04/06/20

Energy Diagram_ Chemistry

Hello! I need to draw an energy diagram but I am mildly confused as to how to go about it. The diagram below shows steps in the exothermic chemical reaction of bromomethane with hydroxide to form... more
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04/06/20

balance these reactions and identify the type
Pb(OH)2 + HCl ----> H2O + PbCl2Na + H2O -------> NaOH + H2FeCl3 + NaOH ----> Fe(OH)3 + NaClCan you help me figure out how to balance these reactions and how to identify them? I have a hard... more
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