Sodium reacts with oxygen to produce sodium oxide as follows: 4Na(s) + O2(g) → 2Na2O(g) If you have 22.74 g of Na, how many grams of O2 are needed for the reaction?

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Q: The density of a liquid is 7.4 g/mL qnd has a mass of 22.58 g. What is the volume in mL

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Q: Why do molecules exist independently?

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Q: Calculate the mass of 1.92 x 1018 atoms of Mg. O 2.73 x 10-10g O 2.16 x 10-10 g O 1.62 x 104g O 1.08...

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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.