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A chocolate chip cookie recipe calls for 0.050 moles of baking soda (NaHCO3). How many grams should the chef mass out?
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Explanation:
Note that the number of moles is equal to the actual given mass of the substance over its molar mass.
n = m/M, where n is the moles, m is the given mass, M is the molar mass.
In manipulating this formula, you get that the given mass is equal to the number of moles multiplied by the molar mass of substance.
m = n x M.
(Na = 23, H = 1, C = 12, O = 16)
Molar mass = 23 + 1 + 12 + (16x3)
= 84
1) m = 0.050 x 84
2) m = 4.2 g
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According to the mole concept, 4.2 g of baking soda should be weighed out.
What is mole concept?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
Baking soda has molar mass of 84 g /mole, thus mass is calculated using number of moles formula which is mass= molar mass×number of moles, which is mass=84×0.050=4.2 g.
Thus,4.2 g of baking soda should be weighed out by chef.
Learn more about mole concept,here:
https://brainly.com/question/12805690
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