A carbon-12 atom has 6 protons, 6 neutrons, and 6 electrons. how many protons does a carbon-14 atom have?
2 answers:
Answer: Option (a) is the correct answer.
Explanation:
As the given atom is so, it means that it contains 6 protons. Also, when an atom is neutral then its number of protons equal to the number of electrons.
Atomic mass means the sum of total number of protons and neutrons present in an atom. As is an isotope of
. And, all the isotopes of carbon or any other element contains the same number of protons but different number of neutrons.
Therefore, there will be 6 protons present in .
Thus, we can conclude that carbon-14 atom have 6 protons.
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Answer:
According to mass and volume, block density is 2 g/ml
Explanation:
Density is a measure, usually used in physics and chemistry, that relates the mass and volume of a solid or compound.
In general terms, the density is directly proportional to the mass, and inversely proportional to the volume, so increasing the mass will also increase the density.
The formula used to calculate the density is
ρ =
Therefore, according to the mass and density of the block
ρ = = 2g/ml
Being the density of the block equal to 2 g/ml.
<em>The other options are not possible, because the values given do not correspond to the result of the equation.</em>
163 grams (3 sig. fig.).
<h3>Explanation</h3>- Formula of <em>carbon(IV) oxide</em> (a.k.a. carbon dioxide):
.
- Molar mass of
.
- Formula of ethyne: structural
or molecular
.
- Molar mass of
.
All carbon atoms in that 104 grams of ethyne will end up in . Number of moles of molecules in 104 grams of ethyne:
.
There are two carbon atoms in each ethyne molecule. Number of carbon atoms in that many ethyne molecules:
.
There are one carbon atom in each molecule. In case oxygen is in excess, all those carbon atoms from that 104 grams of ethyne will make
of
.
Mass of all those molecules:
. (3 sig. fig. as in the mass of ethyne.)