Atomic mass is determined by the number of protons plus the number of _____. a)electrons b)neutrons c)charges d)atoms
2 answers:
Answer: Option (b) is the correct answer.
Explanation:
Atomic mass means the sum of total number of protons and neutrons present in an atom. On the other hand, atomic number is only the sum of total number of protons present in an atom.
Generally, when we write symbol of a neutral element denoting its atomic mass and number then atomic mass is placed on the top left corner and atomic number is written on the bottom left corner.
For example, shows atomic mass of fluorine is 19 and its atomic number is 9.
Thus, we can conclude that atomic mass is determined by the number of protons plus the number of neutrons.
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There are 1.2 hr would this current have to be applied to plate out 7. 20 g of iron .
Calculation ,
Given ; Current ( I ) = 5. 68 A
In , the valancy of Fe is +2 .
2 moles of are required for the decomposition of 1 mole of Fe .
7. 20 g of Fe in moles = 7. 20 g /55.845 g/mol =0.12 mole
x moles of are required for the decomposition of 0.128 mole of Fe .
moles of are required = 0.256 moles
Charge on 1 mole of = 96500 C
Charge on 0.256 mole of = 24704 C
Current ( I )= Q/t
t =Q / I = 24704 C/5. 68 A = 4349 sec = 1.2 hr
Therefore , there are 1.2 hr would this current have to be applied to plate out 7. 20 g of iron .
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Answer : The mass of nitric acid is, 214.234 grams.
Solution : Given,
Moles of nitric acid = 3.4 moles
Molar mass of nitric acid = 63.01 g/mole
Formula used :
Now put all the given values in this formula, we get the mass of nitric acid.
Therefore, the mass of nitric acid is, 214.234 grams.