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mamaluj [8]
3 years ago
14

How do i know how many neutrons of an element

Chemistry
2 answers:
Alex_Xolod [135]3 years ago
8 0

Answer:

neutrons = atomic mass - atomic number.

hope that helps

alekssr [168]3 years ago
4 0

Answer:

Since the vast majority of an atom's mass is found its protons and neutrons, subtracting the number of protons (i.e. the atomic number) from the atomic mass will give you the calculated number of neutrons in the atom. In our example, this is: 14 (atomic mass) – 6 (number of protons) = 8 (number of neutrons).

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How many grams of carbon should be burned in an excess of oxygen at stp to obtain 2. 21 l of carbon dioxide?.
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You must burn 1.17 g C to obtain 2.21 L CO2 at
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The balanced chemical equation is
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Step 1. Convert litres of CO, to moles of CO2.
STP is 0 °C and 1 bar. At STP the volume of 1 mol
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Moles of CO2= 2.21 L CO2 × (1 mol CO2/22.71 L
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Step 2. Use the molar ratio of C:CO2 to convert
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It looks as if you are using the old (pre-1982)
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