HELP ME with THIS I am time i have a little bit of time and still have more questions !!! CHEMISTRY!!
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Answer:
1. is B 2. is C or B
Explanation:
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CO has a molar mass of 44.01 g/mol, which means that 1 mole of CO weighs 44.01 grams.
We want to convert 14.35 grams of ethanol to acetic acid, so we need to know how many moles of ethanol there are. Let's first multiply the given mass of ethanol by its molar mass:
14.35 (g) x 32.06 (g/mol) = 45.85 mol
So, we have 45.85 moles of methanol. If methanol reacts with CO to produce acetic acid, we need to know how many moles of CO we need to use, based on the stoichiometry of the reaction. The reaction equation gives us a 2:1 ratio for CO and methanol:
2 CH₃OH(l) + CO(g) → CH₃CO₂H(aq)
So, for every mole of CH₃OH we react, we will need 0.5 mole of CO. Therefore, we need 23.92 moles of CO to convert all the methanol to acetic acid.
Using the mass of 1 mole of CO, we can convert moles of CO to grams:
23.92 (mol) x 44.01 (g/mol) = 1050.93 (g)
So, we need 1051 grams of CO to completely convert 14.35 grams of methanol to acetic acid.
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The Precision of a calculated answer is limited by the least precise measurement used in the calculation is false.
what is Precision?
If the average value of different measurements is similar to the correct value of the measurement is said to be accurate and if the value of different measurements is close to each other then it is said to be precise.
The everage value of the different measurements may or not may be the same as exact and the resultant values must be the same as the calculated value for the precision of the result.
Therefore, the Precision of a calculated answer is limited by the least precise measurement used in the calculation is false.
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The discoverer of the electron was Thomson. The model of the atom that is missing from the set is the Thomson’s model. J. J. Thomson portrayed his atom model to look like a plum pudding. In his model, he described that an atom is composed mainly of electrons.
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Cl is chlorine. Since their is 5 of chlorine, we call it pentachloride. Penta means 5, as in the shape PENTAgon.
Compound Name: Phosphorus pentachloride
We can see here that the compound with the formula, is called phosphorus pentachloride.
What is a compound?
A compound is a substance that consists of two or more different elements chemically bonded together in fixed proportions. In a compound, the constituent elements lose their individual properties and form new chemical properties unique to the compound.
The study of compounds is central to chemistry, as it involves understanding the structure, composition, and reactivity of substances. Compound analysis and synthesis play vital roles in various scientific fields, such as materials science, pharmaceuticals, and environmental science.
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The potassium nuclei have been unstable and results in the spontaneous decay without any external force. Thus, option 3 is correct.
Potassium has been the metal of group 1 of the periodic table. It has been consisted of 19 protons and 20 neutrons in the nucleus.
Decay of potassium nuclei
The nuclei decay has been achieved when there has been loss of the protons in the nuclei, resulting in the radioactive isotopes.
The potassium nuclei have been unstable and results in the spontaneous decay without any external force. Thus, option 3 is correct.
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In general though, the potassium atom has 19 protons, and has 1 valence electron in the 4s orbital. The nucleus of the atom contains 19 protons and (21 neutrons on average.) If we were too apply the laws regarding the band of stability then that ratio is very stable and it is very unlikely (less than 10^-21%) that the nucleus would ever go through any form of decay.
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Answer:
The space occupy by the 180.0 g of gold will be 9.32 cm³
Explanation:
Given data:
Mass of gold = 180.0 g
Volume occupy by the gold = ?
Solution:
The given problem will be solved through the density formula.
Density is equal to the mass of substance divided by its volume.
Units:
SI unit of density is Kg/m3.
Other units are given below,
g/cm3, g/mL , kg/L
Formula:
D=m/v
D= density
m=mass
V=volume
The density of gold from literature is 19.320 g/cm³
Now we will put the values in formula.
19.320 g/cm³ = 180.0 g/ V
V = 180.0 g/ 19.320 g/cm³
V = 9.32 cm³
The space occupy by the 180.0 g of gold will be 9.32 cm³.