CHEMISTRY HIGH SCHOOL

Suppose you had 100 grams of water what is the molar mass of H2O

Answers

Answer 1
Answer: Molar mass H₂O :

1.00 * 2 + 16.0 = 18.0 g/mol

hope this helps!

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HELP ME ASAP PLEASE IDK THIS

What is the atomic mass of one mole of O?

Answers

Oxygen's atomic weight is 16.00 amu. 1 mole of oxygen is 6.02 x 10^23 atoms of oxygen 1 amu = 1.661 x 10^-24g. I hope this helps you. The correct answer for this question is "1.661 x 10^-24g".

Rutherford’s gold foil experiment provided evidence for which of the following statements?a. Negative and positive charges are spread evenly throughout an atom.
b. Alpha particles have a positive charge.
c. Gold is not as dense as previously thought.
d. There is a dense, positively charged mass in the center of an atom. Reset Selection

Answers

The answer is (c.) There is a dense, positively charged mass in the center of an atom
In 1899, Ernest Rutherford, a British physicist conducted a study of the absorption of radioactivity by thin sheets of metal foil. On this experiment, he concluded that all the positive charge and the mass of the atom is concentrated in a small fraction of the total volume of the atom which is called the Nucleus.  

During Mr. Nye's science class, students were expected to identify various substances using physical properties they could easily measure. Mr. Nye gave each of the five groups a green, metal cube and asked them to identify what the cube was made of. Matt's cube, after 5 trials, had an average density of 7.40 g/cm3 . His group's cube was made of A) aluminum. B) gold. C) nickel. D) zinc.

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 His group's cube was made of D) zinc. Looking up the density values of each of the choices, it can be seen that zinc has the closest density out of all of them. It's actual density has a value of 7.14 g/cm3. The others have density values that are way too far from the average density of 7.4 g/cm3.

Answer: D.) Zinc

Explanation:

As carbon dioxide sublimes, its entropy
(1) decreases (2) increases (3) remains the same

Answers

Answer: (2) increases

Explanation: Entropy is the measure of randomness or disorder of a system. More is the random arrangement of molecules in a system , more is the entropy of the system. More ordered is the arrangement of molecules in a system, less is the entropy of the system.

When carbon dioxide sublimes, it means solid carbon dioxide is directly changing to gaseous state without undergoing into liquid state, thus the molecules will be more random and thus the entropy will increase.
When something sublimes (Goes straight from solid to gas), it takes in energy, as it is an endothermic process, so its entropy increases

How many moles of CaO form when 98.60 g CaCO3 decompose

Answers

The balanced reaction is:

CaCO3 = CaO + CO2

We are given the amount of CaCO3 to decompose when heated. This will be our starting point.

 

98.60 g CaCO3 ( 1 mol CaCO3 / 100.09 grams CaCO3) (1 mol CaO / 1 mol CaCO3 ) ( 56.08 g O2 / 1 mol CaO) =  55.25 g CaO

0.9851mol.                      This is the rt answer just did it

Which type of bond is present in hydrogen sulfide (H2S)? The table of electronegativities is given.

Answers

nonpolar covalent bond (with LD force)
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