436 CHAP 1 138. You have two rigid gas cylinders. Gas cylinder A has a volume of 48.2 L and contains N2(g) at 8.35 atm at 25 °C. Gas cylinder B has a volume of 22.0 L and contains He(g) at 25 °C. When the two cylinders are connected with a valve of negligible vol- ume and the gases are mixed, the pressure in each cylinder becomes 8.71 atm. (Assume no reaction when the gases are mixed.) a. How many nitrogen molecules are present? b. What is the total number of moles of N2(g) and He(g) pres- ent after the gases are mixed? c. What was the beginning pressure of cylinder B containing only the He(g) (i.e., before the valve was connected)? lindors were

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Q: A sample of gas occupies 4.23L at 3.46 atm. what is the volume at 2.25 atm? (assume T is a constant

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Q: 2.5 L of octane gas, C8H18, is combusted with 20.5 L of oxygen gas and ignited. What volume of…

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Q: of total mass 80g. 14% of the total mass is nitrogen. The nitrogen is occupying a volume of 0.995…

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Q: 3 H2 (g) + N2 (g) --> 2 NH3 (g)   A 3.22 L vessel containing the hydrogen at 21.1 oC and 6.750 atm…

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Q: Hydrogen gas can be generated from the reaction between aluminum metal and hydrochloric acid. 2Al(s)…

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Q: Container A holds 737 mL737 mL of an ideal gas at 2.60 atm.2.60 atm. Container B holds 174 mL174 mL…

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Q: 1. A gas mixture contains each of the following gases at the indicated partial pressures: N2, 226…

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Q: Hydrogen gas is produced by the reaction between metallic aluminum and aqueous hydrochloric acid.…

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.