Menu. Even though we say that molecular mass of nitrogen is 28, it means that molecular mass … (Assume that the molecule's velocity is perpendicular to the two sides that it strikes.) The density of air or atmospheric density, denoted ρ (Greek: rho), is the mass per unit volume of Earth's atmosphere.Air density, like air pressure, decreases with increasing altitude. Molecular mass is obtained by multiplying the atomic mass of an element with the number of atoms in the molecule and then adding the masses of all the elements in the molecule. Answered Calculate the mass one nitrogen molecule in kg 1 See answer riya6304 is waiting for your help. Questions; physics - HELP. =310#-26 kg 13. (a) If it takes 3.80 10-13 s for a nitrogen molecule to hit a wall About Nitrogen gas; Nitrogen gas weighs 0.001251 gram per cubic centimeter or 1.251 kilogram per cubic meter, i.e. (1 u is equal to 1/12 the mass of one atom of carbon-12) Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol. The kinetic energy (KE) of a particle of mass (m) and speed (u) is given by:[latex]\text{KE}=\frac{1}{2}m{u}^{2}[/latex] Expressing mass in kilograms and speed in meters per second will yield energy values in units of joules (J = kg m 2 s –2).To deal with a large number of gas molecules, we use averages for both speed and kinetic energy. 14. It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772. When we say *molecular mass* we mean the actual mass of one teeny tiny molecule of nitrogen, that is, the mass that a weighing scale would show us if we took one molecule of nitrogen (N2) and weighed it (This is just an explanation, but in reality we can't really take just one molecule of N2, obviously). Weights of atoms and isotopes are from NIST article. Percentage by mass of nitrogen = ( Mass of nitrogen atom / Mass of ammonia molecule ) x 100 = ( 14 / 17 ) x 100 = 82% The formula for a molecule of nitrogen is N2. So, you know how many atoms are in a mole. The average speed of a nitrogen molecule in air is about 671 m/s, and its mass is 4.21×10-26 kg.? When students know more about the structure of air (mainly nitrogen and oxygen) then the mass of their atoms can be estimated (they are fairly close in mass). CO-Carbon dioxide 4. Estimate the rms speed of the molecules of air in this room. (f) What is the average force per unit area? Mass of one molecule of nitrogen = 28 / 6.022 × 10 23 g = 4.64 × 10-23 grams.. Avogadro's number is one of the most important constants used in chemistry. which is only possible if I use mass of two nitrogen atoms. PCl 5-Phosphorus trichloride (a) 1 and 2 (b) 3 and 4 (c) 1 and 3 (d) 2 and 4 Ans : (b) 3 and 4 CO - Carbon monoxide. ‘Dalton’s atomic theory is contradicted by the formula of sucrose (C 12 H 22 O 11).’ Justify the statement. PCl 5 - Phosphorus pentachloride. The average speed of a nitrogen molecule in air is about 686 m/s, and its mass is 4.85×10-26 kg. Mass of one molecule of oxygen asked Aug 14, 2019 in Class X Science by navnit40 ( … Ask your question. 0 2 2 × 1 0 2 3 molecules-28 gram thus, 6. We can calculate the mass of one molecule of carbon dioxide by adding together the masses of 1 atom of carbon and 2 atoms of oxygen. Nitrogen also has a direct toxic action of its own, affecting brain functions and inducing a stupor or euphoria. Solution: 1) Note that the mass of a specific isotope is required. Enter a chemical formula: Browse the list of common chemical compounds. 1. Add your answer and earn points. Please help :-) Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). HCl-Hydrogen chloride 3. Alternatively, you can express this as 2×NA , where NA is Avogadro's constant.. Although Carl Wilhelm Scheele and Henry Cavendish had independently done so at about the same time, Rutherford is generally accorded the credit because his work was published first. Hence, one molecule of nitrogen weighs 4.64 × 10-23 grams. Q. Log in. The average speed of a nitrogen molecule in air is about 686 m/s, and its mass is 4.85×10-26 kg. Nitrogen is the chemical element with the symbol N and atomic number 7. O 2 is a diatomic molecule. Join now. Using electron-dot diagrams which show only the outermost shell electrons show how a molecule of nitrogen N2 is formed from two nitrogen atoms. riya6304 riya6304 2 weeks ago Chemistry Secondary School +5 pts. \[12.01 \: \text{amu} + 2 \left( 16.00 \: \text{amu} \right) = 44.01 \: \text{amu}\] The molecular mass of a compound is the mass of one molecule of that compound. Its mass is 4.70 x 10^-26 kg. The average speed of a Nitrogen molecule in air is about 313 m/s, and its mass is about 4.68 × 10^−26 kg. We should say ‘one mole of nitrogen atoms’ or ‘one mole of nitrogen molecule’. ∴ Mass of O 2 molecule = 2 × 16 = 32 amu. Select the incorrect match. 1mole of nitrogen molecule - 6. This is the simplified version of the kinetic energy equation that was shown on the previous page book. Question 9. If it takes 3.78×10-13 s for a nitrogen molecule to hit a wall and rebound with the same speed but moving in the opposite direction. molar mass = mass of one particle x Avogadro's constant (6.02 x 1023 mol-1) Example If 1 atom has a mass of 1.241 x 10-23g 1 mole of atoms will have a mass of 1.241 x 10-23g x 6.02 x 1023 = 7.471g MOLE CALCULATIONS Substances mass g or kg molar mass g mol-1 or kg mol-1 Example Calculate the number of moles of oxygen molecules in 4g oxygen molecules have the formula O2 the relative mass … Components in Dry Air. Therefore, Mass of an air molecule = 28.2 / 5 x 10-26 = 5.6 x 10-26 kg. But since each individual molecule consists of 2 atoms of nitrogen, the number of moles of nitrogen atoms will be twice that of nitrogen gas molecules. A mole is like saying a dozen of something or a pair of something. And what we're gonna do is we're gonna fill in these numbers. What is the average force the molecule exerts on one of the walls of the container? (g) How many oxygen molecules traveling at this speed are necessary to produce an average pressure of 1 atm? The average speed of a nitrogen molecule in air is about 6.70 102 m/s, and its mass is about 4.68 10-26 kg. Alternatively, you can express this as 2×NA , where NA is Avogadro's constant.. To answer this question we must first define the mole. Ignore some of the other answers, they are incorrect regarding the real reason. Ask your question. Calculating the mass of 1 molecule of ammonia: Mass = ( Number of hydrogen atoms x Mass of hydrogen atom) + ( Number of nitrogen atoms x Mass of nitrogen atoms) Mass = ( 3 x 1 ) + ( 1 x 14) = 17.