C) lithium; 3
Explanation:
Considering the chart describing the element. According to the chart, the element is lithium with an atomic number of 3.
- Atomic numbers are used on the periodic table to arrange elements in their proper place.
- Atomic number is the number of protons in an atom.
- This number is unique for every atom.
- From the described chart, we see that the atom described is Lithium.
- The atomic number of neon is 10, boron is 5.
- Unless otherwise stated or shown, it can be nitrogen 7.
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Data can arranged into visual displays called graphs. There are multiple types of graphs such as bar graphs, line graphs, scatter plots, and pie charts.
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The above ionic compound is called gallium sulphate
Answer:
1.30 m
Explanation:
First we <u>calculate the number of moles of solute in the solution</u>, using the <em>definition of molarity</em>:
- Molarity = moles / liters
- Converting 250 mL ⇒ 250 / 1000 = 0.250 L
- moles = 1.50 M * 0.250 L = 0.375 moles
Then we <u>calculate the mass of solvent</u>, using the <em>given volume and density</em>:
- 1.15 g/mL * 250 mL = 287.5 g
- Converting <em>287.5 g to kg</em> ⇒ 287.5 / 1000 = 0.2875 kg
Now we <u>calculate the molality of the solution</u>:
- molality = moles of solute / kg of solvent = 0.375 mol / 0.2875 kg
