Answer:
Consider how the speaker begins the speech, the support given in the body of the speech, and how the speaker concludes. Listen for changes in tone. Listen for how the speaker uses delivery techniques such as pauses, pace, voice, metaphors and symbolism, repetition and parallelism, and vocabulary.
Explanation:
The fourth period contains 18 elements, beginning with potassium and ending with krypton. As a rule, period 4 elements fill their 4s shells first, then their 3d and 4p shells, in that order; however, there are exceptions, such as chromium.
Cr. I think
Answer:
0.0386
Explanation:
To make a solution, we need a certain amount of the solute to be dissolved in the solvent. The solvent is the carrier medium usually water in traditional wet chemistry.
Now, in this particular question, it should be known that methyl alcohol is the solute, while water is the solvent.
We need to calculate the mole fraction of the solute as asked by the question. Now what we do is to find the number of moles of each, add together, then divide the number of moles of methyl alcohol by the sum of the moles of both.
Firstly, we calculate the number of moles of methyl alcohol present. This is mathematically equal to dividing mass by molar mass
Molar mass of methyl alcohol (CH3OH) is 12 + 4(1) + 16 = 32g/mol
The number of moles is thus 1.2/32 = 0.0375 moles
Now, we calculate the number of moles of water. The molar mass of water is 18g/mol
The number of moles of water is thus 16.8/18 = 0.93333
The mole fraction of the solute is thus:
0.0375/(0.0375 + 0.9333) = 0.0386
