14.Calculate the number of moles in 46 g of Sodium?
Answers
Formula to calculate the no. of moles: No of moles = known mass of a substance/ molar mass of the substance. So in 46 grams, 2 moles of Na are present.
Answer: The correct answer is 2 moles.
Explanation: The formula for the number of moles formula is expressed as-
Given -
46 grams of sodium
A number of moles formula is.
Number of moles = Mass of substance / Mass of one mole
so according to this putting values in the equation we get-
The molar mass of sodium =23
The given mass of sodium =46
Hence, the total number of moles =
Mass / Molar mass =
46 / 23 =2
whereas the molar mass/molecular weight is actually the sum of the total mass in grams of the atoms present to make up a molecule per mole. The unit of molar mass is grams/mole and the moles are the mass of a substance that contains 6.023 x 1023 particles of the substance. The mole is the SI unit for the amount of a substance. Its symbol is mol. By definition: 1 mol of carbon-12 has a mass of 12 grams and contains 6.022140857 x 1023 of carbon atoms.
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