Imagine you are at a local water park on a hot summer day and your feet begin to get hot from the cement. Looking ahead, you not
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The nuclear symbol of an element have three parts namely:
- the symbol of an element
- mass number of the element
- atomic number of the element
The general representation is as:
where X is the chemical symbol of the element, A is mass number of the element that is total number of neutrons and protons in the nucleus of an atom, and Z is atomic number of the element that is number of protons in the atom.
Element = Gallium, (given)
Number of neutrons = 40 (given)
Let the nuclear symbol be . So, we need to determine the values of "?" in the symbol.
Atomic number of Gallium, = 31
Since, atomic number = Number of protons.
So, number of protons of Gallium, = 31
Mass number = number of protons + number of neutrons
Substituting the values:
Mass number =
So, the nuclear symbol is .
Answer:
You need to dissolve 144 gr of glucose in 0.8 liters of water to have a 1 M solution.
Explanation:
Molarity is the amount of moles per liter of solution --> moles/liters. We are trying to get a 1 molar solution and we also know the liters (0,8L) so
after canceling liters of water you get 0,8 moles of glucose.