447 Answered Questions for the topic chem

06/03/21

Please you don’t understand what I mean when I say I need help please help me with chemistry please I am so desperate

S   + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2OIn the above equation how many moles of water can be made when 110.4 grams of HNO3 are consumed?Round your answer to the nearest tenth. If you answer is a... more
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06/03/21

Hello. It may not seem like it but I am under pressure and need so much help with my chemistry as soon as possible please please please ok please please please please

1.) 2 NH3 + 3 CuO --> 3 Cu + N2 + 3 H2OIn the above equation how many moles of N2 can be made when 165.7 grams of CuO are consumed?Round your answer to the nearest tenth. If you answer is a... more
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06/03/21

Please hear me out. I need help with my chemistry homework fast because my school is almost over and I don’t know what I can do. Please help me with my chemistry homework as soon as possible

1.) For the reaction C + 2H2 → CH4, how many moles of hydrogen are needed to make 153.2 grams of methane, CH4 ?Round your answer to the nearest tenth. If you answer is a whole number like 4, report... more
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06/03/21

Hi I need so much help before the school ends and I am crying I am so confused and stressed please help me with my chemistry homework

1.) 2 NH3 + 3 CuO --> 3 Cu + N2 + 3 H2OIn the above equation how many moles of N2 can be made when 157.4 grams of CuO are consumed?Round your answer to the nearest tenth. If you answer is a... more
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06/03/21

I need help please if you only you hear my voice youd know how incredibly desperate I am please help me with my Chemistry homework as soon as possible please

1.) S   + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2OIn the above equation how many moles of water can be made when 163.6 grams of HNO3 are consumed?Round your answer to the nearest tenth. If you answer is... more
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06/03/21

Hello so I am under a lot of stress and pressure. Please help me with my chemistry homework quickly please I am on the verge of crying
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?Sodium chlorate decomposes into sodium chloride and... more
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Chem Chemistry

05/25/21

How do you draw the isomer moulecule 3-ethyl-2,4,5-trimethyloctane
Draw the isomer below based on its name. (Hint, start by drawing the base hydrocarbon, octane, and then draw the ethyl and methyl groups off of the correct carbons.) It must be labeled with atoms... more
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Chem Chemistry

05/24/21

An aqueous solution has a freezing point of -13.8 ∘C, what is the boiling point of the solution? The Kf value for water is 1.86 ∘C/m, and the Kb value for water is 0.520 ∘C/m.
An aqueous solution has a freezing point of -13.8 C, what is the boiling point of the solution? The Kf value for water is 1.86 C/m, and the Kb value for water is 0.520 C/m.
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05/19/21

Chemistry Help needed!!
SHOW WORK. A 6.0ft person weighs 168lb. Express this person's height in meters and weight in kilograms.(1lb=453.g;1m=3.38ft.) solve using dimensional analysis
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05/19/21

Consider the following reaction for the questions below: Ca + Br2 --> CaBr2
a. What type of reaction(s) is/are being represented by the chemical reaction above?b. Is this reaction an oxidation-reduction (redox) reaction?c. If this is a redox reaction, then identify the... more
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Chem Chemistry

05/17/21

How many grams of calcium fluoride are present in 107.0 g of a 26.0% calcium fluoride in water solution?
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05/12/21

ASAP: Please show all work : Use the data in the table below to calculate the value of the standard molar entropy S°, for B2 (g) at 25°C. 
(c) Use the data in the table below to calculate the value of the standard molar entropy S°, for B2 (g) at 25°C. Please show all workSubstance: Standard Molar Entropy, S° (J/Kmol)AB(g) 217.9AB2(g)... more
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05/12/21

Which of the following can be determined about ∆So for the reaction?
A student conducts a reaction at 298 K in a rigid vessel and the reaction goes to completion. The temperature of the reaction vessel drops during the reaction. Which of the following can be... more
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05/12/21

PLEASE HELP *Which of the following pairs of conditions are needed to construct a similar cell that generates the highest cell potential?
Fe2+(aq)+Zn(s)→Fe(s)+Zn2+(aq)E°cell=+0.32VA galvanic cell generates a cell potential of +0.32V when operated under standard conditions according to the reaction above. Which of the following pairs... more
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05/12/21

Calculate the molarity (M) of 450. mL (4.50 x 10^2 mL) of NaBr solution prepared by dissolving 20.50g NaBr
A) 0.443 MB) 4.34 MC) 0.450 MD) 4.43 M
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05/12/21

What is the volume of 0.2550 M HCI solution reqiured to completely neutralize 15.50 mL of 0.2110 M NaOH?
A) 12.83 mLB) 15.5 mLC) 18.73 mLD) 12.38 mL
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05/12/21

Consider a 7% starch solution and a 2% starcg solution separated by a semipermiable membrane. Which process will occur?
A) water will flow from 2% into 7% starch solutionB) water will flow in both direction C) all of these will occurD) water will flow from 7% into 2% starch solution
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05/12/21

A solution has OH- concentration as 1.0 x 10^-3. pH of this solution is:
A) 11B) 10C) -11D) 9
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05/11/21

STOICHIOMETRY - what is the PERCENTAGE YIELD OF ASPIRIN?

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 gMass of watch glass = 8.677 gMass of filter paper, watchglass... more
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05/11/21

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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05/10/21

list answer clearly
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
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05/07/21

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
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05/07/21

 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
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05/05/21

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.
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05/05/21

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.
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