Answer:
The element is Magnesium.
Explanation:
On the periodic table, elements are arranged based on atomic number and chemical similarity.
- A group on the periodic table is a vertical column that places elements with very similar chemical characteristics together. For instance, the elements in group 18 are all gases (this group is named the Noble Gases group).
- A period on the periodic table is a horizontal row that places elements that show periodic trends together. They also have very similar characteristics (same amount of subshells that house electrons).
If we look at the periodic table, we will notice that there are eighteen groups and seven periods. And, we can also see that the groups are vertical while the periods are horizontal.
Therefore, if we count two across and three down, we will see the element Mg - atomic number 12. Mg is the element <em>symbol</em>, not the name, so we can look and see that the name of the element is Magnesium.
Answer:
An adult male is between 2.4-3m (8-10 feet) in size and weighs between 350-680kg (775-1500lbs). Females are slightly smaller at around 1.8-2.4m (6-8 feet) and weigh between 150-250kg (330-550lbs).
Answer:
The molarity is 3.42
Explanation:
The molarity reflects the concentration of a solution and indicates the number of moles of solute per liter of solution. In other words, the molarity (M) is the number of moles of solute that are dissolved in a given volume.
The Molarity of a solution is determined by the following formula:
Molarity is expressed in units ().
To know the amount of moles of solute (NaCl) you must know its molar mass. If:
- Na: 23 g/mole
- Cl: 35.45 g/mole
the molar mass of NaCl is: 23 g/mole + 35.45 g/mole= 58.45 g/mole
Now you apply a rule of three as follows: if 58.45 g of NaCl are present in 1 mole, 10 grams of the compound in how many moles are they?
moles= 0.171
Then:
- number of moles of solute: 0.171 moles
- volume= 50 mL= 0.05 L (being 1 L=1000 mL)
Replacing in the definition of molarity:
Molarity= 3.42
<u><em>The molarity is 3.42 </em></u><u><em></em></u>