CHEMISTRY HIGH SCHOOL

Determine the mass 2 mol Li??

Answers

Answer 1
Answer: You can look on the periodic table for the number of automic mass units in each element. 

1 mole Li = 6.94 amu
6.94 • 2 = 13.9 amu

There are 13.9 amu in 2 moles of Li
Answer 2
Answer: Molar mass Li = 6.94 g/mol

1 mol --------- 6.94 g
2 mol --------- ?

Mass Li = 2 * 6.94 / 1

Mass Li = 13.88 g

hope this helps!

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What is c2h5oh and the difference between it and c2h6o

Answers


-Physical condition: C₂H₅OH is liquid; CH₃OCH₃ is a gas.
-Reactivity: C₂H₅ reacts with sodium (Na) metallic, releasing H₂ and forming the sodium  ethoxide, Na (+) C₂H₅-O (-) (C₂H₅ONa).CH₃OCH₃ no reacts with sodium.-water solubility: C₂H₅OH dissolves in any proportionCH₃OCH₃ is poorly soluble in H₂O.
-polarity: C₂H₅OH is very polar, form hydrogen bonds.CH₃OCH₃ is little polar, doesn't have H available to form hydrogen bridge.
Write C₂H₆O may cause ambiguity because there are 2 different substances with this formula:-ethyl alcohol or ethanol = CH₃---CH₂---H
methyl ether = CH₃---O---CH₃

If you label a bottle only with C₂H₆O, will be very difficult to know if the compound is methyl ether or ethanol, which can be very dangerous in the laboratory. As only the ethanol C₂H₅OH is structured, it is convenient to use preferably this formula. For the methyl ether, it is more efficient to use the formula CH₃OCH₃.

hope this helps!

Over 99% of the mass of an atom is located

Answers

in the nuclues

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When you buy muriatic acid at the hardware store, you are actually buying hydrochloric acid. if you poor it directly on your concrete, and if your concrete contains enough limestone in it, you can actually get a pretty cool reaction. what numbers, in the correct order from left to right, would go in the blanks in order to balance this equation: ___hcl(aq) ___caco3(s) → ___cacl2(aq) ___ co2(aq) ___ h2o(aq)

Answers

The balanced chemical equation for the reaction between hydrochloric acid (\(HCl\)) and calcium carbonate (\(CaCO_3\)) is:

2HCl(aq) + CaCO3(s) → CaCl2(aq) + CO2(g) + H2O(l)

Final answer:

In the reaction of hydrochloric acid and calcium carbonate, to balance the equation, the correct order of numbers would be 2 for HCl, and 1 for CaCO3, CaCl2, CO2, and H2O.

Explanation:

When hydrochloric acid (HCl) reacts with calcium carbonate (CaCO3) in concrete, it forms calcium chloride (CaCl2), carbon dioxide (CO2), and water (H2O). To balance this reaction, you could input the numbers: 2 HCl(aq) + 1 CaCO3(s) → 1 CaCl2(aq) + 1 CO2(g) + 1 H2O(l). This phenomenon is part of the larger concept known as a neutralisation reaction, where an acid reacts with a base to produce a salt and water. In this case, the hydrochloric acid is the acid and the calcium carbonate in the concrete is the base. This is also an example of a gas evolution reaction, as carbon dioxide gas is being produced.

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The atomic weight of an unknown element, in atomic units (amu), is approximately 20% less than that of calcium, the atomic weight of calcium is 40 amu. Which of the following best approximates the atomic weight, in amu, of the unknown element? (a) 8 (b) 20 (c) 32 (d) 48

Answers

a) 8

40*20%

=40*20/100

=800/100

=8

Final answer:

The atomic weight of the unknown element, which is approximately 20% less than calcium (40 amu), is estimated to be 32 amu.

Explanation:

The atomic weight of an unknown element is said to be approximately 20% less than that of calcium, which has an atomic weight of 40 atomic mass units (amu). To calculate the approximate atomic weight of the unknown element, take 20% of 40 (which is 8) and subtract it from 40. The result is 32 amu (40 - 8 = 32), so the correct answer is (c) 32.

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Greenhouse gases help regulate earths. A) oceans B) acid rain C) atmosphere D) temperature

Answers

greenhouse gases help regulate earth by D. temperature
Greenhouse gases help regulate earths D. Temperature.

What information can a foliated metamorphic rock provide you about the conditions under which it formed?

Answers

A foliated rock forms when the minerals are realigned due to the presence of high temperature and pressure. The minerals align in such a way that the axes are directed to where the pressure was applied.
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