Homework Help

Hi, I have a problem where I am to calculate the temperature inside a container after releasing some of the gas (N2) out from the container itself. To calculate the temperature (T2) I am given the temperature before releasing the gas (T1), and also the pressure inside the container before (p1) and after (p2). First i though i might be able to use (p1/T1 = p2/T2)., However, with this I am just ignoring the parameter n, number of molecules, and I am unsure if this is the correct method to use. (pV = nRT) Any help in explaining how to approach this would be much appreciated.

Hmmmm?

Hi, I have been trying to solve the Equilibrium Constant for my lab work. Some of the solutions have reactants with an equilibrium concentration of 0 M. Does this mean my Equilibrium Constant will be undefined since the denominator becomes zero when I use the formula for Equilibrium Constant? Thanks

Proxima centuri the nearest star to earth. how to calculate the distance? what are proxima A and proxima B?

Hello, everyone! I have a quick homework question that I assume has some relation to the reactivity series? It goes like this: "Would it be a good idea to store a solution of zinc nitrate in a container made of iron? Why or why not?" I suspect it would be a fine idea to store the solution of zinc nitrate in a container made of iron because iron is less reactive than zinc and cannot displace it? I'm not entirely sure, as we skimmed over the reactivity series in class, so I would really appreciate a more in-depth and thorough answer. Thank you guys so much!

The possible gametes that could be formed are ABG and abg. So how would you find the genotype?

A hiker walks 200m west and then walk 100 m North in what direction is his/her resulting displacement? draw the figure to show your answer.

I need a little help with how to go about the essay question below on a hypothetical situation. Any help would be greatly appreciated. You are working with a previously uncharacterised gene in human cells. Discuss the approaches and confirmatory steps you would employ to clone this gene to determine where the protein is localised in the cell?

Hi guys, I'm doing a biology access course (this current module is about neurotransmitters and drugs), and i'm a little stumped by this one. All of the info i've read online is too complex for my current level of understanding, but here is what I (kind of) understand so far. Also, i'm not that bothered about getting the answer 'correct', but about understanding this stuff, as it seems a little contradictory to me. So, Antagonist drugs work by binding to the receptor of a neuron WITHOUT activating it, thus increasing the concentration of the neurotransmitter in the synapse as NTs cannot bind to these receptors - what I don't understand about this, and I guess it's …

think a body which is at rest but not in equilibrium?

Hello everyone! I have been tasked with creating a airbag from a plastic sandwich bag, acetic acid, and sodium bicarbonate. The volume of my sandwich bag is 0.87 L, the pressure in my area is 100.6 kPa, and the temperature in the room is 295.15 K. First, I am tasked to find the mass of NaHCO3 needed. My calculations are as follows: n = PV / RT n = (100.6 kPa)(0.87 L) / (8.314 kPa x L / mol x K)(295.15 K) n = 0.03566682292 mol NaHCO3 M = 75.028 g/mol m = n x M m = 2.676 = 2.7 g Now, I need to calculate the volume of acetic acid, but I run into a roadblock: nHC2H3O2 = (0.03566682292 mol NaHCO3)(1 mol HC2H3O2 / 1 mol NaHCO3)…

I was told to find the range of a function f(x) = (x²-1)/(x-1) where x cannot be 1. I know the proper solution is this : Since x cannot be 1, f(x) reduces to x+1 therefore Range = R - {2} Bu at my first attempt I did this: let y = (x²-1)/(x-1) yx - y = x²-1 x² - yx + y -1 =0 For x to be real, the discriminant of this equation should be >= 0 Therefore y² - 4(y-1) >= 0 (y-2)² >= 0 y can take all real values. Now, where did I go wrong? Why is 2 also coming in the range with the second method? How do I distinguish when to find the range using the 2nd method and when not?

The problem: A liter of a mixture pf 0.4 Sodium Chloride and 0.2M Potassium Chloride. I really don't know what to do with the compounds present in the solution. Do I need to add them? I'm really lost. This is the last problem in the activity, the others are easy to understand and solve, but for me this one is hard to comprehend. Maybe I need to calculate for their masses individually? What do you guys think?

For an experiment I have to calculate de wavelength of a sound using a Lloyd mirror, the reciever and transmitter are fixed and the sound mirror is moving towards the optical axis. I know i have te work with fringe spacing or something like that but I dont know how exactly

Hello again, everyone! Today, I present you all with a question about dilution and it's formula of C1V1=C2V2. I believe it's also common to see "M" in place of "C". My question is, "How many mL is needed to dilute a 100 mL solution of NaOH with a concentration of 10M to a concentration of 2M." I believe the answer is 20 mL: C1V1=C2V2 C1 = 10M (initial concentration) V1 = ? (this is the amount of solution that must be transferred, right?) C2 = 2M (desired concentration) V2 = 100 mL (not entirely sure why this value is 100 mL, but I think it is because that's how much I want to end up with?) (10M)(V1) = (2M)(0.1 L) V1 = [(2M)(…

I was required to do the error analysis for an experiment with the aim of finding the relative density of a body. In the experiment, the weight of the body in air war found to be w₁ = 8.00 +- 0.05 N while the weight of the body in water was found to be w₂ = 4.00 +- 0.05 N. Using the relation, ρ = weight in air / (weight in air - weight in water) where ρ denotes relative density, I did the error analysis as shown in the attachment. However, my friend did the error analysis as this: ρ = w₁/(w₁- w₂) Δρ/ρ = Δw₁/w₁ + Δ(w₁- w₂)/(w₁- w₂) Δρ/ρ(max) = Δw₁/w₁ + (Δw₁+Δw₂)/(w₁- w₂) Δρ/ρ(max) = 0.05/8 + (0.05+0.05)/(8-4) …

C + O2 → CO2 mC = 2680 kg = 2680000 g mO2 =? mCO2 = ? MC = 12.01 g/mol MO2 = 2MO MO2 = (2)(16.00 g/mol) MO2 = 32.00 g/mol MCO2 = MC + 2MO MCO2 = (12.01 g/mol) + (2)(16.00 g/mol) MCO2 = 44.01 g/mol nC = mC / MC nC = (2680000 g) / (12.01 g/mol) nC = 223147.3772 mol nO2 = (223147.3772 mol C) (1 mol O2 / 1 mol C) nO2 = 223147.3772 mol nCO2 = (223147.3772 mol O2) (1 mol CO2 / 1 mol O2) mCO2 = nCO2 X MCO2 mCO2 = (223147.3772 mol)(44.01 g/mol) mCO2 = 9820716 g mCO2 = (9820716 g) / (454 g/lb) mCO2 = 21632 lbs Therefore, the mass of CO2 produced from coal is 21632 l…

Hello everyone! I am new to chemistry and am working on a question that I got stuck on. If anyone could help me to continue my work, it would be greatly appreciated. The chemist used a solution of lead nitrate, Pb(NO3)2, with a concentration of 0.025 mol l-1. If they were preparing one litre of this solution, what mass of lead nitrate should they weigh out? For the initial calculations, I used the relative atomic mass (RAM) for each element and got the result for : RMM Pb(NO3)2 = 331 The relative molecular mass of lead nitrate is 331. The mass of one molecule of lead nitrate is 331 g. The molar mass of lead nitrate is 331 g mol-1. I was…

Hey everyone! Super quick question. "Is 6.94 g/mol Li a conversion factor?" I'm just unsure of what the answer could be. I assume it is because you use the molar mass to determine the mass of a substance? Thanks for the help!

link deleted Hey i need some help, i need some feedback on my research. Thank you.

Hello, I have question is with applying Moment distribution method in calculating moments in a frame with two forces; one vertical & one horizonal. (Please see attached) No sway is assumed. It's a frame i.e; joints B & C are fixed. My lecturer has included an example with moments created from both vertical & horizontal forces applied to frame. Then he goes on to say (in an email) that the Moment distribution method can't be used to calculate horizontal forces, only vertical forces I have spent time trying to email the Lecturer & Tutors about this problem and they won't even take the time to read my email(s) properly …

What our activity want us to identify: list the number of different minerals in the sample and give a description of each one. It is a 4 items activity, I didn't attach the others since they are easy to identify. Please help me with this one.

"The five basic types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion." Where do (a) precipitation (b) acid-base and (c) redox reactions fit under those 5 categories. Thanks

So In Class We learned About Circets And The Types Such As Parallel And Series Could Somebody Explain

My teacher allows us to turn in a paper for extra credit on a practical use of calculus. I'm looking to do a paper on how calculus can be applied in medicine and/or life science. Anyone have any suggestions on topics?