Answer:
A solution labeled "0.105 M NaOH" would contain 0.105 moles of NaOH in each liter of solution.
Explanation:
The concentration of a solution in Molarity (M) stands for the number of moles of that substance contained in 1 L of solution.
Molarity = Concentration in mol/L = (Number of moles of solute) ÷ (Volume of solution in L)
Molarity = Concentration in mol/L = 0.105 M = 0.105 mol/L
Number of moles of solute = ?
Volume of solution in L = 1 L
0.105 = Number of moles of solute × 1
Number of moles of solute = 0.105 mole
Hence, a solution labeled "0.105 M NaOH" would contain 0.105 moles of NaOH in each liter of solution.
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B. neutrons
C. electrons
Among all the given options, the correct option is option B. If an atom has 6 protons, 6 neutrons, and 6 electrons, its isotope would have a different number of neutron.
A chemical element's isotope is one of two or more types of atoms that have the same atomic number, location in the periodic table, and virtually similar chemical behavior, but differ in atomic mass and physical characteristics.
The first step in identifying and labeling an atom is to count the protons inside its nucleus. Usually, this number of protons is represented by the letter Z.
The fact that all atoms that share the same atomic number possess essentially equal chemical characteristics lends the atomic number its enormous significance. If an atom has 6 protons, 6 neutrons, and 6 electrons, its isotope would have a different number of neutron.
Therefore, the correct option is option B.
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They would be:
Alpha- these are fast moving helium atoms.
Beta- these are fast moving electrons.
Gamma - these are photons, just like light, except of much higher energy, typically from several keV to several MeV.
The mass ratio of potassium and selenium in the given compound is equal to 1 : 2.
The mass ratio also known as the percent composition by mass defines the proportion of a particular compound that consists of the constituent elements of that compound.
The percent composition by mass of a constituent element of a compound can be determined by the division of the mass of that element by the molar mass of the compound, followed by its multiplication by 100.
According to the law of constant proportion, a pure compound is always made up of the same elements combined together in a fixed proportion by weight.
Given the mass of the potassium (K) in the compound = 39 g
The mass of selenium (Se) in the compound = 78
The mass ratio of K and Se is 39 : 78
The simplest form of the ratio of potassium and selenium is 1 : 2.
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B. mass and volume
C. length and mass
D. solubility and mass
Answer:
B.) Possibly making an infrence.
Explanation:
Judging on what sshe saw, she can try to infer or come up with an answer. [based on what she observed.]