428 Answered Questions for the topic chem

What is the percentage yield of aspirin? (STOICHIOMETRY)

Density of Acetic Acid = 1.082 g/mlMass of Salicylic Acid = 5.102 gVolume of Acetic anhydride = 10.00 mlMass of filter paper = 0.0654 g Mass of watch glass = 8.677 gMass of filter paper,... more

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which of the following gives the relative size of Ka and pH of a 0.10 M solution of HEX3(aq)?HEX3(aq) + H2O(l) ⇌ H3O+(aq) + EX3−(aq)∆Go = +47 kJ/molrxnThe reaction between the acid HEX3(aq) and... more

which of the following gives the relative size of Ka and pH of a 0.10 M solution of HEX3(aq)?

HEX3(aq) + H2O(l) ⇌ H3O+(aq) + EX3−(aq)∆Go = +47 kJ/molrxnThe reaction between the acid HEX3(aq) and water is shown above. Based on the chemical equation and the value of ∆Go given above, which of... more

 Based on the value of ∆Go and the chemical reaction, which of the following is true about the reaction?

2 EMZ3(g) ⇌ 2 EZ3(g) + M2(g)∆Gorxn = −350 kJ/molrxnA small sample of EMZ3 is placed into an evacuated, rigid metal container and allowed to reach equilibrium. Based on the value of ∆Go and the... more

HELP Chemistry. energy required to heat

At 1 atm, how much energy is required to heat 53.0 g H2O(s) at −22.0 ∘C to H2O(g) at 119.0 ∘C? In KJ.

Vapor pressure of a certain liquid

A certain liquid has a vapor pressure of 92.0 Torr at 23.0 ∘C and 206.0 Torr at 45.0 ∘C.a. Calculate the value of delta H vap for this liquid.b. Calculate the normal boiling point of this liquid.

05/04/21

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Sodium chlorate decomposes into sodium chloride and oxygen gas as seen in the equation below. 2NaClO3­ --> 2NaCl +3O2 How many moles of NaCl were produced by 7 moles of NaClO3­? Round your... more

05/04/21

I have been ignored and helped incorrectly by tutors please would someone kindly help me with my chemistry homework

1.) 2 NH3 + 3 CuO g 3 Cu + N2 + 3 H2OIn the above equation how many moles of N2 can be made when 13 moles of CuO are consumed? 2.) Sodium chlorate decomposes into sodium chloride and oxygen gas as... more

05/04/21

Please understand that no one has helped me and I need help with my chemistry homework please help me please respond

1.) S   + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2OIn the above equation how many moles of H2SO4 can be made when 56 moles of HNO3 are consumed?2.) S   + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2OIn the above... more

05/04/21

So no one has helped me with my chemistry homework at all and I really need it so please someone respond and help me as soon as possible

1.) 3 Cu + 8HNO3 g 3 Cu(NO3)2   + 2 NO + 4 H2OIn the above equation how many moles of NO can be made when 58 moles of HNO3 are consumed? 2.) 2 NH3 + 3 CuO g 3 Cu + N2 + 3 H2OIn the above equation... more

05/03/21

Hi so um I need help with my homework and I have needed help for many hours please someone respond and help me as soon as possible

1.) S   + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2OIn the above equation how many moles of H2SO4 can be made when 56 moles of HNO3 are consumed?2.) S   + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2OIn the above... more

05/03/21

I need so much help with my chemistry homework because I have been stuck for days please help me as soon as possible please

1.) 3 Cu + 8HNO3 --> 3 Cu(NO3)2   + 2 NO + 4 H2OIn the above equation how many moles of water can be made when 25 moles of HNO3 are consumed?2.) Sodium chlorate decomposes into sodium chloride... more

05/03/21

Hello so no tutor has helped me and I am in desperate need of help with my chemistry homework as soon as possible please

1.) 3 Cu + 8HNO3 g 3 Cu(NO3)2   + 2 NO + 4 H2OIn the above equation how many moles of NO can be made when 58 moles of HNO3 are consumed? 2.) 2 NH3 + 3 CuO g 3 Cu + N2 + 3 H2OIn the above equation... more

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1.) For the reaction C + 2H2 → CH4, how many grams of hydrogen are required to produce 17 moles of methane, CH4 ?Round your answer to the nearest tenth. If you answer is a whole number like 4,... more

Hi so no tutors have helped me at all I need so much help. I have needed help for many hours with my chemistry homework please help me as soon as possible please

S   + 6 HNO3 → H2SO4 + 6 NO2 + 2 H2OIn the above equation, how many grams of water can be made when 4.4 moles of HNO3 are consumed?Round your answer to the nearest tenth. If you answer is a whole... more

Vapor pressure of a certain substance

A certain substance has a heat of vaporization of 33.31 kJ/mol. At what Kelvin temperature will the vapor pressure be 4.50 times higher than it was at 291 K?

All tutors have completely ignored me please correctly help me with chemistry homework as soon as possible please

S   + 6 HNO3 → H2SO4 + 6 NO2 + 2 H2OIn the above equation, how many grams of water can be made when 4.4 moles of HNO3 are consumed?Round your answer to the nearest tenth. If you answer is a whole... more

hello please respond I desperately need help with my chemistry homework as soon as possible please

1.) For the reaction C + 2H2 → CH4, how many grams of hydrogen are required to produce 17 moles of methane, CH4 ?Round your answer to the nearest tenth. If you answer is a whole number like 4,... more

Vapor Pressure of a certain liquid

A certain liquid has a vapor pressure of 92.0 Torr at 23.0 ∘C and 206.0 Torr at 45.0 ∘C.a. Calculate the value of delta H vap for this liquid.b. Calculate the normal boiling point of... more

Energy required to heat water

At 1 atm, how much energy is required to heat 53.0 g H2O(s) at −22.0 ∘C to H2O(g) at 119.0 ∘C? In KJ.

Calculate the amount of aniline - in mL - needed for the reaction

A reaction uses 5.00 millimoles of aniline. the molecular weight of aniline is 93.13 g/mol and the density is 1.02 g/mL. Calculate the amount of aniline - in mL - needed for the reaction

Half Reaction: Balance H2O and OH-

When the following half reaction is balanced under basic conditions, what are the coefficients of the species shown? _____SnO32- +  _______H2O   ______SnO22- +  ______OH-In the above half reaction,... more

The acid-dissociation constants of HC3H5O3 (aq) and CH3NH3+ (aq) are given in the table above. Which of the following mixtures is a buffer with a pH of approximately 10.5?

Given:HC3H5O3--> Ka: 8.3*10^-4CH3NH3+---> Ka: 2.3*10^-11 The acid-dissociation constants of HC3H5O3 (aq) and CH3NH3+ (aq) are given in the table above. Which of the following mixtures is a... more

ASAP Show all workout and answer all parts ( Im just reviewing for AP exams so its not graded, but I want it to help me.

A weak acid, HZ, has a Ka value of 6.52 x 10-5.(a) Write the reaction of HZ with water. (b) Write the equilibrium expression for the reaction of HZ with water.(c) Calculate the pH of a... more

Show all workout and answer all parts ( Im just reviewing for AP exams so its not graded, but I want it to help me.

Show all workout and answer all parts ( Im just reviewing for AP exams so its not graded, but I want it to help me.A new weak acid, HG, has been synthesized. The a titration of 0.115g of... more

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