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3 years ago

Which of the following best defines one mole of a substance?

Chemistry

1 answer:

AlexFokin [52]3 years ago

4 0

Answer: D. Amount of substance present in Avogadro‘s number of particles of the substance

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 Liters at STP, contains avogadro's number $6.023\times 10^{23}$ of particles and weighs equal to the molecular mass of that substance.

A mole is defined as the amount of substance that contains Avogardro number of the substance. Avogadro's number is given by $6.022\times 10^{23}$ .

$1mole=6.022\times 10^{23}$ particles

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What’s the answer????

dezoksy [38]

Should be , b
. Not positive tho

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2 years ago

in an experiment 3.425g of lead oxide was reduced to form 3.105g of lead the empirical formula of the lead oxide is?

Romashka-Z-Leto [24]

Answer:

Pb3O4

Explanation:

According to this question, 3.425g of lead oxide was reduced to form 3.105g of lead in an experiment. Since lead oxide contains both lead (Pb) and oxygen (O) element,

Mass of lead oxide = 3.425g

Mass of lead = 3.105g

Mass of oxygen = (3.425g - 3.105g) = 0.320g

Next, we convert each mass value to mole by dividing by respective molar mass

Pb = 3.105g ÷ 207.2 = 0.0149mol

O = 0.320g ÷ 16 = 0.02mol

Next, we divide each mole value by the smallest (0.0149)

Pb = 0.0149mol ÷ 0.0149mol = 1

O = 0.02mol ÷ 0.0149mol = 1.342

Multiply each ratio value by 3 to get:

Pb = 1 × 3 = 3

O = 1.342 × 3 = 4.026

The whole number ratio, approximately, of Pb and O is 3:4, hence, their empirical formula is Pb3O4.

4 0

2 years ago

When are the products of an equilibrium reaction favored? When the reaction is endothermic. When the equilibrium constant is lar

PtichkaEL [24]

Product are favored at ...

example 2A + 3B = 5C + D if reaction is exothermic ....delta H = NEGATIVE)

A decrease in temperature favors the forward reaction (more product formed)
as heat is considered as a product

For the exam I have given: A decrease in pressure (volume increases as pressure decreases) .... there are more number of moles on the product side (6 in all) .....so according to LCP decreasing pressure will revert back to increase pressure and to do that equilibrium position shifts to the right (product)

decreasing concentration of product will cause a disturbance in equilibrium position....and reaction will restore its equilibrium by shifting to the right

(I believe its like this)

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2 years ago

Read 2 more answers

Which of the following contains the most atoms?

aksik [14]

Explanation:

9.0122 g be Maybe, sorry i don't think so

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2 years ago

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DanielleElmas [232]

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$Ca(OH)_{2} (aq) + CO_{2}(g) ----> CaCO_{3}(s) +H_{2}O(l)$

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3 years ago