Homework Help

The problem is as follows: The density of dry air at 1.00 atm and 34.4 degrees Celsius is 1.15g/L. Calculate the composition of air (percent by mass) assuming that it contains only nitrogen and oxygen and behaves like an ideal gas. (Hint: First calculate the "molar mass" of air, then the mole fractions, and then the mass fractions of O2 and N2.) This is my first time posting here so if I'm breaking any rules please let me know. I'm supposed to answer this problem with the information given and not assuming any values. The answer in the book is O2: 28% and N2: 72% I have been stuck on this problem for the past few hours and nothing I do seems to get me to the correct…

Hi guys, I need help with these problems. TYVM

I have no idea what to do with this problem.. Can anyone help me answer this please?

Please can someone explain to me what this question is asking for.. Explain the principles of estimating the rate of an enzyme catalysed reaction and the importance of measuring the initial rate of reaction..? Thanks

I am working on a project regarding selfish gene theory in relation to intelligence and thoughts in animals. Could someone simplify the selfish gene theory for me? I don't feel like I'm grasping the concept

Topic -Effects of competition during larval stages on adult life history traits using butterflies Hey everyone, Thank you for having me (newbie here ). I was hoping if any one could guide us or help us (by 'us' i mean that i'm working in a group) as our project is based on the above mentioned topic. We've formulated the null and alternative hypothesis as; null- there will be no effect of competition during larval stages on adult life history traits using butterflies alternative -there will be effect of competition during larval stages on adult life history traits using butterflies How can we design the experiments…

The distant star, ∆A_6325, is traveling at 70 km/sec away from us and has a peak observed brightness at 400 nm. An exoplanet orbits ∆A_6325 in a transit orbit, causing a 1.4% brightness drop as the planet crosses the star. The ratio of the star’s radius and the planet’s radius is 145:1. The planet was determined to have a density of 2.36 g/cm3. The orbital radius of the planet is 3.14 AU and has an orbital period of 6.32 years. a) Find the mass of ∆A_6325. b) Determine the distance of the star/system, using the most inaccurate method on the intergalactic distance ladder. c) Determine the power of the star. d) Determine the intensity of the star on the …

a uniform rod has length 6l and mass m. an axis is a distance l from the end perpendicular to the length of the rod . find the moment of inertia of the rod about this axis. can some1 show me how to find this.

As we know that the promoter is present in the start of a gene i.e. at 5' and RNA polymerase attaches on promoter to start mRNA synthesis. If it so, then, when RNA polymerase start its function to form mRNA it should be synthesize from 3'-5'. e.g. 5' CGAGGTCC 3' is a gene sequence then promoter region is present at 5' which allows RNA polymerase to attach. Then RNA polmerase moves from 5'-3', if it is so, then in which direction mRNA should synthesize?

Please name 2 of the major building blocks that are derived from glucose and what macromolecules are those building blocks used to make to support cell growth and proliferation? I thought the major building block would be pyruvate? What would be the second major building block? Also I thought that pyruvate would be used to synthesize DNA and Fatty Acids. Feedback or your ideas is much appreciated as I am studying for a midterm. Thanks I think ATP may be the other answer they are looking for.

At the venous end of a capillary, consider these values: within the capillary, hydrostatic pressure is 18 mm HG and colloid osmotic pressure is 28 mm HG. In the interstitial fluid, hydrstatic pressure is 0 mm HG while colloid osmotic pressur eis 1 mm HG. What are the net hydrostatic pressure and the net colloid osmotic pressure? What is net filtration pressure and does fluid move in or out of the capillary?

When threshold is reached, what are the roles of calcium ions at the axonal terminal? What are the functions of the: 1. Neurotransmitter 2. Post synaptic neuron receptors 3. synaptic cleft 4. synaptic vessicles 5. removal of the neurotransmitter 6. Ion channels affected 7. excitation or inhibition of post synaptic neuron Please be deatiled.

Hi so the question is as follows and I am not really good at physics, but I really want to improve and get better, so please DO NOT give me the answer, just push me in the right direction, thanks { The natural length of a spring is 10cm and its force constant is 5N/m. Now one side of the spring is fixed and the other side is connected to a ball, which has a mass of 6g. If the ball is moving in a horizontal circle with a uniform speed 10m/s, what is the total length of the spring when it is extended?} I tried using Hooke's Law Force, the Centripetal Force equation and the Force equation (f=ma) but they don't seem to get me anywhere? Is there anything I am missi…

Any help would be greatly appreciated Here is my nutrition/science question. Are any of the below ingredients a 'polyol monoester of a fatty acid' and/or a 'monoglyceride' (or even contain one of these ingredients during formation)? Eryithritol Fructose Sodium Bicarbonate Corn Starch Sodium Acid Pyrophosphate Monocalcium Phosphate Sea Salt Cane Syrups Buttermilk Powder Thank you and God bless, -James

Hi I am Currently working on an structure elucidation, for the compound C7H12O4. From the current information I have I have deduced that it has 2 C=O bonds and at least one OH group. Typically I would use the H-NMR to assist with the structure but, I am confused as there are only two singlets. one occur at 2.6ppm and another at 1.3ppm. with integrals 1.5 and 2 respectively. Any help with this structure would be appreciated

A. Complex regression B. Multiple experimental methods C. Double analysis D. Multiple regression I believe it is D, but I'm not sure.

A. A false correlation B. More accurate data C. A more representative sample D. A stronger regression I believe it's A. Is this right? Could it be D?

Question: "Given the mass and radius of the planet Mercury, calculate the density." Mass: 3.3010 x 10 to the 23rd kg Radius: 2.440 x 10 t0 the 6th m

If the Hubble constant were to be 2.0 x10-18 s-1, what would the age of the universe be, in seconds x1017? (1. ) (Find the number by taking the inverse of the Hubble constant. That means divide 1 by the Hubble constant. Just write the whole number that you get as a result in the following blank, with no decimal points or zeros.) What would that age of the universe be in billions of years? (2. ) (Find the number by dividing your previous answer by the number of seconds in a year. Round the resulting billions of years off to the tenths; for example if you calculated 19,779,300,000 years, which is 19.7793 billion years, you would just write 19.8). If the …

We know that enough exercise can alter a muscle's chemistry. How is it related to post excess exercise oxygen consumption?

Question: "Consider two stars, Star A and Star B. Star A has a temperature of 4505 K, and Star B has a temperature of 8903 K. Star B emits ___ times more energy flux than Star A". I'm just not sure how to do the calculations/set up the problem, I'm taking an online class and the professor has provided little to no details about specific calculations (it is a lab class).

I'm a graduate student in a soil science class. We've all had that one professor that refuses to help, right? I'm struggling to understand what might be simple concepts because I just can't establish a base knowledge for his course. The problem at hand is in the photo. What's the difference between cmolc and cmol? Is it just a matter of equivalent weight? Does anybody have an example or might be willing to point me in the right direction? Thanks!

In the laboratory, mice can be genetically engineered to express the transgene called NeuT. This gene is involved in the development of breast cancers. In the figure below, please explain the graph and what happens when HK2 is knocked out. I'm very confused and thing to help understand the graph or to help start me off on this question would be great!

The cost of an asset is $1,110,000, and its residual value is $300,000. Estimated useful life of the asset is five years. Calculate depreciation for the second year using the double-declining-balance method of depreciation. (Do not round any intermediate calculations, and round your final answer to the nearest dollar.)

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