![]() (i) Your answer for part (h) should be three times as large as the answer for part (g). What is the average force the molecule exerts on one of the walls of the container? (Assume that the molecule’s velocity is perpendicular to the two sides that it strikes.) (f) What is the average force per unit area? (g) How many oxygen molecules traveling at this speed are necessary to produce an average pressure of 1 atm? (h) Compute the number of oxygen molecules that are contained in a vessel of this size at 300 K and atmospheric pressure. What is (a) the average translational kinetic energy of an oxygen molecule at a temperature of 300 K (b) the average value of the square of its speed (c) the root-mean-square speed (d) the momentum of an oxygen molecule traveling at this speed? (e) Suppose an oxygen molecule traveling at this speed bounces back and forth between opposite sides of a cubical vessel 0.10 m on a side. This molar mass calculator allows you to double check if you’re getting the right answer.Oxygen ( O 2 O_ O 2 ) has a molar mass of 32.0 g/mol. Let us try to calculate and see how it goes. 1 mole of oxygen 6.022 × 10 23 number of oxygen molecules. Molar mass: The mass of one mole of oxygen. So the mass of one molecule of oxygen will be 2 × 16 u 32 u. Finally, add the products together and you’ll arrive at the answer.Īfter reading and working through these three examples, you should be able to calculate the molar mass of anything. of one O X 2 molecule (the whole O O entity). Next, multiply the number of a particular element by its molar mass. In this compound, there 2N, 8H, 1C, and 3O. ![]() Start by determining how many of each elements there are. The only difference is you’ll need to multiply the subscript on the outside of the parenthesis by the subscripts inside the parenthesis. 3 mol O2 Molar mass of KClO3 122.55 g / mol Molar mass of O2 32 g / mol 0.384 g loss 0.384 g 02 produced 0.384 So, produced 02 0.012. The process is very similar to calculating the molar mass of a simple compound. Finally, add the products together and you’ll arrive at the answer. ![]() In this compound, there are 1 C, 4 H (3+1), and 1 O. ![]() Start by determining how many of each elements there are by looking the subscripts (small number next to the element symbol). All you need to do is find the atomic mass of the element on the periodic table and report the number with the unit grams per mole or g/mol.įrom this, you can see that sodium’s molar mass will be 22.99 g/mol. We can’t determine the mass of this immediately. Formula: The relative atomic mass indicates how many times larger the mass of a given atom is than 1/12 the mass of the 12 C carbon isotope. Answer (1 of 4): Step by step answer: You said that we’re working with 3.011024 molecules of oxygen gas. Fe4Fe(CN)63, NaHCO3, ch3coonh4, h2so4, pb(c2h3o2)23h2o, caso41/2h2o) and press Enter or click Calculate button. By the end of this post, you’ll be able to calculate the molar mass of anything.įinding the molar mass of a single element is really simple. Enter a chemical formula to calculate its molar mass (e.g. We’ll go through three examples progressing from easy to “difficult”. Intensive: pressure p, temperature T, density g, mole fraction a (O2), molar concentration c(N2). How to calculate molar mass with examples That substance can be an element or a compound. Simply said, molar mass is how much one mole of a substance weighs. Lets start by talking what the term means.
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