Answer:
the first three statement
Explanation:
If the mass number of an atom is 29, and it has 13 protons and 13 electrons, the identity of this atom is Aluminum.
<h3>What is an atom?</h3>
An atom is the smallest indivisible particle of an element which still retains its chemical identity.
An atom consists of a nucleus surrounded by electrons. The nucleus is made up of protons and neutrons.
The identity of a chemical element is determined by its electron and proton number, which is the same for a neutral atom.
According to this question, the atom of an element has 13 protons and 13 electron. This suggests that the atom is that of Aluminum.
Learn more about atoms at: brainly.com/question/1566330
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Answer:
<em><u>= 0.1 M </u></em>
Explanation:
450mL = 0.45L
If 24g of a solute are weighed by 1 mole of solute
1.2g of a solute will be weighed by ( 1.2 ÷ 24 )
=<u> 0.05 moles of a solute.</u>
0.45L of a solution are occupied by 0.05 moles
1L will be occupied by ( 1÷0.45 ) × 0.05
= 0.1 M
The IUPAC name of a carboxylic acid is derived from that of the longest carbon chain that contains the carboxyl group by dropping the final -e from the name of the parent alkane and adding the suffix -oic followed by the word “acid.” The chain is numbered beginning with the carbon of the carboxyl group.