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Olenka [21]
3 years ago
8

What is the approximate percent composition by mass of cabr2 (formula mass =200)

Chemistry
1 answer:
Aleksandr [31]3 years ago
8 0
<h3>Answer:</h3>

20% calcium and 80% Bromine

<h3>Explanation:</h3>
  • The percentage composition of an element in a compound is given by dividing the mass of the element in the compound by the relative formula mass of the compound and expressing it as a percentage.
  • % Composition = (mass of element in 1 mole of compound /relative formula mass of the compound) 100%

Our compound is CaBr₂

Formula mass = 200 g

Relative atomic mass of Ca = 40.078

Relative atomic mass of Br = 79.904

Therefore;

% composition of Ca = (40.078/200) 100%

                                  = 20.039

                                  = 20 %

% composition of Br = (79.904×2)/200) 100%

                                 = 79.904 %

                                = 80%

Therefore; the approximate % composition by mass of CaBr₂ is 20% calcium and 80% Bromine

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Anastaziya [24]

An atom with an atomic number of 10 and a mass number of 24 would have 14 neutrons.

<h3>What is atomic number and mass number?</h3>

The term atomic number, conventionally denoted by the symbol Z.

Atomic number indicates the number of protons present in the nucleus of an atom, which is also equal to the number of electrons in an uncharged atom.

The mass number of a given atom is defined by the number of protons and neutrons present in the nucleus. In simple,

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1)
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