What weighs more? 1 mol of Gold, or 1 mol of Lead. A. You cannot determine the answer to this question from this information alone B. They both weigh the exact same amount C. 1 mol of Gold D. 1 mol of Lead

Answers

Answer 1

Answer: b, they both weigh the exact same. they’re both 1 mol

Answer 2

Answer:

Final answer:

1 mol of Lead weighs more than 1 mol of Gold because lead has a higher atomic mass (207.2 g/mol) compared to gold's atomic mass (197.0 g/mol). Option D. is correct.

Explanation:

Consider the atomic masses of both gold and lead, as the question involves comparing a mole of each. Importantly, the molar mass of any substance is numerically equivalent to its atomic weight in Atomic Mass Units (amu). The atomic mass of gold is approximately 197.0 amu while lead has an atomic mass of around 207.2 amu.

Therefore, a 1 mol of Lead (207.2 g) would weigh more than 1 mol of Gold (197.0 g).

Learn more about Molar Mass here:

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A few pieces of dry ice, CO2(s), at -78°C are placed in a flask that contains air at 21°C. The flask is sealed by placing an uninflated balloon over the mouth of the flask. As the balloon inflates, the dry ice disappears and no liquid is observed in the flask.State the direction of heat flow that occurs between the dry ice and the air in the flask.
Write the name of the process that occurs as the dry ice undergoes a phase change in the flask. [1]
Compare the entropy of the CO2 molecules in the dry ice to the entropy of the CO2 molecules in the inflated balloon.

Answers

Answer:

Heat flows from the air into the dry ice.
Sublimation (its when a solid becomes a gas without becoming a liquid first).
CO2 molecules in gaseous phse has more entropy than in solid phase.

Explanation:

To sublimate dry ice needs to fain energy, wich is provided by the surrounding air.
Solid is the more condensated state of matter, so it has less entropy than any other state of matter.

The direction of heat flow is from surroundings to system (air to ice), the dry ice is subliminating.

Fe(NO3)2 not sure how to get the oxidation numbers of all elements

Answers

You must remember that oxidation number of hydrogen in acids is always +1, oxidation number of oxygen in oxides & acids is always -2... metals has always oxidation number on plus!

group NO3 comes from HNO3...and oxidation number of whole acid group is always on minus and equal to the amount of hydrogen atoms in this acid... so oxidation number of NO3 = -1

we have 2 NO3 groups so 2*(-1) = -2 and that is the reason why oxidation number of Fe in this formula must be +2... because sum of all elements always gives 0!

Now we could count of oxidation number for nitrogen... we write HNO3 and start counting from right to left:
3*(-2) from oxygens + 1 from hydrogen = -5
so nitrogen must have +5 oxidation number... because sum all in formula must be 0.

According to Bohr's model, what can be said of the amount of energy that an electron absorbs when it is excited compared to the amount of energy that it releases when it returns to ground state?A. The amount of energy that is absorbed is greater than the amount of energy that is released.

B. The amount of energy that is absorbed is the same as the amount of energy that is released.

C. The amount of energy that is absorbed is less than the amount of energy that is released.

Answers

letter b. because energy can't be created nor destroyed

Calculate the number of moles
230 g of C2H5OH
560 g of C2H4
0.640 g of SO2

Answers

mass of C = 12g
mass of H = 1g
mass of O = 16g
mass of C2H5OH = 46g = 1 mole

1 mole of C2H5OH ------------ 46g
x moles of C2H5OH ----------- 230g
x = 5 moles of C2H5OH

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mass of C = 12g
mass of H = 1g
mass of C2H4 = 28g = 1 mole

1 mole of C2H4 -------------- 28g
x moles of C2H4 ------------- 560g
x = 20 moles of C2H4
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
mass of S = 32g
mass of O = 16g
mass of SO2 = 64g = 1 mole

1 mole of SO2--------------------- 64g
x mole of SO2 -------------------- 0,64g
x = 0,01 moles of SO2

Under conditions when glucose oxidation is elevated, the acetyl-CoA produced will allosterically activate which of the following enzymes leading to an increase in the production of oxaloacetate?a. Pyruvate carboxylase

b. Citrate lyase

c. Acetyl-CoA carboxylase

d. Malate dehydrogenase

Answers

The correct answer is ( a. Pyruvate carboxylase).

When glucose oxidation is elevated, the acetyl-CoA produced will allosterically activate the enzyme pyruvate carboxylase, leading to an increase in oxaloacetate production.

What does the empirical formula of a compound describe?

Answers

it is what form where all coeficients are made into the smallest whole numbers

example

2C+4HC=8HC could be simplified to
C+2HC=4HC (note: formula is not a liegit one, only for example)

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