mean molecular weight of sun

mean molecular weight of sun

Uncategorized mean molecular weight of sun. Sun mean molecular weight - vik dhillon In the lecture we introduced the idea of mean molecular weight m.For an fully ionized gas, we gave the expression 1/m = 2 X + 3/4 Y + 1/2 Z, where X, Y and Z are the mass fractions of hydrogen, helium, and everything else, respectively. For the Sun, X = 0.73, Y = 0.26, and Z = 0.01, so 1/m ~ 1.67. • Mean densities are only ~ 100 cm-3, but molecular clouds are very inhomogeneous and have much higher-density regions called clumps and cores. Besides molecular weight dependence, light scattering also has a direct dependence on particle size. Approximately half the original hydrogen in the Sun's core has now been converted to helium. Each hydrogen atom will contribute 1 electron. If the density of the gases is 2 . molecular gas. 6371. For example, a gas of hydrogen atoms (H) has µ =1,whileagasof helium atoms (He) has µ =4. mean mass per particle in terms of the atomic mass unit (amu), which, for our purposes, we declare to be the proton mass, m p. We de ne a quantity , named \mean molecular mass," as = hmi=m p: (3) De ned this way, is numerically equal to the average number of … For the Sun, X = 0.73, Y = 0.26, and Z = 0.01, so 1/m ~ 1.67. https://nssdc.gsfc.nasa.gov/planetary/factsheet/sunfact.html Click hereto get an answer to your question ️ Assume centre of sun to consist of gases whose average molecular weight is 2. Hence, the molecular weight of ionized hydrogen is the average mass of a proton and an electron—namely, 1 / 2 on the atom-mass scale noted above. mu=1.30 (if the gas is not ionized) mu=0.62 (if it is ionized) So what? When X, Y, and Z are the mass fractions of hydrogen, helium, … Mean molecular weight = 24. The perfect gas law applies and the core is completely ionised and made up by 75% hydrogen and 25% helium by mass. 7 3 × 1 0 3 k g / m 3 , at a pressure of 1 . 1.67× 10−27 kg. 2.4.1 Number Average Molecular Weight. This result contrasts to colligative properties, such as osmotic pressure, which only depended on number of particles and therefore gave the number average molecular weight. Active 6 years ago. (1 u is equal to 1/12 the mass of one atom of carbon-12) 1. Molecular weight of a double-stranded DNA molecule = (# of basepairs x 650 daltons) Total weight of the human genome = 3.3 x 109 bp x 650Da = 2.15 X 1012 ... body was placed end to end it would reach the sun and back 600 times! The Sun is composed primarily of the chemical elements hydrogen and helium.At this time in the Sun's life, they account for 74.9% and 23.8% of the mass of the Sun in the photosphere, respectively. The Note that the electron mass has been neglected with respect to … Viewed 959 times 3 $\begingroup$ I have a homework question in which I need to estimate a parameter known as $\beta_{P}$ and also the core temperature, both for the Sun. the mean mass of the particles in the Sun is a little over half the mass of a proton. From X, Y, and Z, you can calculate the mean molecular weight. Volumetric mean radius (km) 695,700. For example, a gas of hydrogen atoms (H) has µ =1,whileagasof helium atoms (He) has µ =4. All heavier elements, called metals in astronomy, account for less than 2% of the mass, with oxygen (roughly 1% of the Sun's mass), carbon (0.3%), neon (0.2%), and iron (0.2%) … Its mass is about 330,000 times that of Earth, and it accounts for about 99.86% of the total mass of the Solar System. … For the Sun, we have. Mean molecular weight: Mean relative molecular mass of the atmospheric constituents in dalton (= unified atomic mass units), equivalent to grams/mole Atmospheric composition (by volume): Relative volume of constituents in the atmosphere, by percentage or ppm (parts per million). • Mass fractions – To work out number densities n j, need to know mass fractions – Mass fraction X j is the fraction by mass of gas that is made up of element j. If the universe is infinite, then it consists of an infinite n… If it turns out there are many such sets of galaxies, the number of atoms would be much greater than the current estimate. b:a. under identical conditions is 24. Weight 1 kg on Earth will weight 27.9307 kg on Sun. Because the gravitational attraction of our Sun for the Earth is the centripetal force causing the Earth's circular motion around the Sun, we can use Newton's law of universal gravitation to find the mass of the Sun without visiting the Sun. This is the same technique you would use to determine the mass of Cygnus X-1 with a probe. In this case, we have the mean molecular weight given by: 1/m = 2 X + 3/4 Y + 1/2 Z. That is 100 trillion cells x 6 feet divided by 93 million miles = 1200. mu=1.30 (if the gas is not ionized) mu=0.62 (if it is ionized) So what? Examples of molecular weight computations: C[14]O[16]2, S[34]O[16]2. This equates to about two nonillion ( short scale) or two quintillion ( long scale) kilograms: The solar mass is about 333 000 times the mass of Earth … mean molecular weight: We must now derive an expression for the mean molecular weight ... For solar composition, X =0.747, Y =0.236 and Z =0.017, resulting in ~ 0.6, i.e. At a given temperature the ideal gas law says this would result in a lower gas pressure, and less support for the star’s weight: In the center of the Sun today, . The mass of one mole of carbon 12 atoms is exactly equal to 12 grams and also its molar mass is equal to 12 grams per mole. Examples of molecular weight computations: C[14]O[16]2, S[34]O[16]2. Next, consider the definition of mean molecular weight. On the other hand weight 1 kg on Sun will weight 0.0358 kg on Earth. Mean molecular weight • Another concept before we dive into equations of state is the mean molecular weight µ, which is important to understand. w = Molecular weight of water, 18.0 g/g-mole (18.0 lb/lb-mole) Other parameters used in stack gas calculations are barometric pressure, density of water, and the molecular weight of water. Ask Question Asked 6 years ago. Relevant Equations: u=(2X+3/4Y+1/2Z)^-1 5.9724: 333,000. For solar composition, X =0.747, Y =0.236 and Z =0.017, resulting in ~ 0.6, i.e. Sun helium has a mass fraction ∼ 0.28, meaning 1g of solar material contains 0.28g of helium – Always true that X j X j = 1 – Conventions: ∗ X j for hydrogen written as X ∗ X j for helium written as Y ∗ Combined X j for all other elements written as Z (metallicity); do not confuse with Z j! • Stellar interiors have a mixture of atoms of different elements and various ionizations. 109.2: Mean density (kg/m 3) 1408. Discontinuities in the mean molecular weight and entropy existalso. µ=1.17 . In the lecture we introduced the idea of mean molecular weight m. For an fully ionized gas, we gave the expression 1/m= 2 X + 3/4 Y + 1/2 Z, where X, Y and Z are the mass fractions of hydrogen, helium, and everything else, respectively. a) Compute the mean molecular mass, μ s, at the surface of the Sun, using standard Solar abundances: (X sun = 0.734 , Y sun = 0.250, Z sun … Adding this all up, for the Sun, X=0.7 Y=0.28 Z=0.02. The temperature of sun is: Mass (10 24 kg) 5.9724 Volume (10 10 km 3) 108.321 Equatorial radius (km) 6378.137 Polar radius (km) 6356.752 Volumetric mean radius (km) 6371.000 Core radius (km) 3485 Ellipticity (Flattening) 0.003353 Mean density (kg/m 3) 5514 Surface gravity (m/s 2) 9.798 Surface acceleration (m/s 2) 9.780 Escape velocity (km/s) 11.186 GM (x 10 6 km 3 /s 2) 0.39860 Bond … kT P. ρ µ = From Carroll and Ostlie, Modern Astrophysics, 2e . The Sun. How to calculate the mean molecular weight of the Sun. 5514. Well, what is happening inside the center of … However, this is reinforced by the decrease in gravity (g) with increasing altitude and also the reduction in mean molecular mass above 100 km altitude. Astronomers use a solar mass as a basic unit of mass. Barometric pressure is the ambient pressure measured during a test so that the results can later be referenced back to standard pressure. Each helium atom will contribute 2, and each higher element will contribute Z (that is, a number equal to the atomic number of the element). The calculation of the number of atoms assumes the universe is finite and has a relatively homogeneous composition. When X, Y, and Z are the mass fractions of hydrogen, helium, … Recall that a mole of any substance contains NA = 6.02252×1023 atoms. In chemistry, molecular mass refers to a molecule's mass as expressed in the number of atoms found in the molecule. 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