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gladu [14]
3 years ago
14

How many atoms are in one mole of gold? A) 1.97 x 1023 atoms. B) 6.02 x 1023 atoms C) 79 atoms. D) 197 atoms

Chemistry
2 answers:
Hatshy [7]3 years ago
8 0

Answer: B) 6.022\times10^{23} atoms.

Explanation:

According to the International System of units ,

A mole is basically denotes a unit that contains 6.022\times10^{23} of atoms.

It is also known as <em>Avagadro Number.</em>

Similarly,  the number of atoms in one mole of gold = 6.022\times10^{23}

hence, the correct answer is B) 6.022\times10^{23} atoms.

Kobotan [32]3 years ago
3 0

B. Is the Answer 6.022 * 1023


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marysya [2.9K]

Answer:

72.57 grams

Explanation:

The mass percentage of gold in the ore is 0.19 %

The mass of ore used = 23 kg

The mass of gold in the ore = \frac{0.19X23}{100}=0.0437kg

moles of gold in the given mass of ore =\frac{mass}{Atomic mass}=\frac{0.437X1000}{197}=2.22mol

As per given equation four moles of Au is giving four moles of complex compound on reacting with NaCN

Then in second reaction two moles of the complex is reacting with one mole of Zinc

Thus two moles of gold are reacting with one mole of Zinc

The moles of Zinc needed = 0.5 X 2.22 mol = 1.11 moles

The mass of Zinc needed = moles X atomic mass =1.11 X 65.38 = 72.57 grams

6 0
3 years ago
Water has a vapor pressure of 23.8 mm Hg at 25°C and a heat of vaporization of 40.657 kJ/mol. Using the Clausius-Clapeyron equat
zubka84 [21]

Answer:

P = 559.553 mmHg

Explanation:

Clasius-Clapeyron:

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∴ P1 = 23.8 mmHg = 3.173 KPa

∴ T1 = 25°C ≅ 298 K

∴ ΔHv = 40.657 KJ/mol

∴ R = 8.314 E-3 KJ/K.mol

∴ T2 = 96°C ≅ 369 K

⇒ Ln P2/P1 = - (40.657 KJ/mol/8.314 E-3 KJ/K,mol) [(1/369 K) - (1/298 K) ]

⇒ Ln P2/P1 = - (4890.185 K) [ - 6.457 E-4 K-1 ]

⇒ Ln P2/P1 = 3.1575

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⇒ P2 = (23.511)(3.173 KPa)

⇒ P2 = 74.601 KPa = 559.553 mmHg

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3 years ago
What kind of properties can only be observed when a substance changes into a different substance? physical properties reaction p
Vitek1552 [10]

When a substance changes into a different substance, you are observing its chemical properties.

In a physical change, the substance must <em>not </em>change into a different substance.

The physical and chemical properties of a substance do <em>not</em> change.

8 0
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What effect does a lone electron pair have on molecular shape?
loris [4]

Using the VSPER theory, the effect of lone pairs on molecular shape can be discussed.

There are 3 types of electron pairs present in a molecular shape: bond pair -bond pair, lone pair - bond pair, lone pair - lone pair.

Strength of repulsions between these three types of pair follows the order:

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Whenever there is an addition of lone pairs to the geometry, some distortions take place which decreases the bond angles and some asymmetry is attained in the original molecular shape.

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Answer:

B

Explanation:

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