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Akimi4 [234]
3 years ago
9

How many sulfur atoms are there in 5.52 mol of sulfur

Chemistry
2 answers:
PSYCHO15rus [73]3 years ago
6 0
Moles * Avogadro constant = 5.52 * <span>6.022 x 10^23</span>
Setler [38]3 years ago
4 0

Answer:

3.324.10^{24}

Explanation:

1 mol of sulfur has6.02.10^{23} (<em>constant of avogadro</em>) sulfur atoms

We want to know how many atoms there are in 5.52 moles of sulfure.

We apply a simple rule of three

1 mol\longrightarrow 6.022.10^{23} atoms \\ 5.52 mol \longrightarrow  x \\ x=\frac{(5.52)mol. 6.022.10^{23}atoms}{1mol}= 3.324.10^{24} atoms

In 5.52 moles of sulfur there are 3.324.10^{24}

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Answer:

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Explanation:

The atoms of hydrogen have smaller mass than oxygen. Thus their speeds have to higher in order to produce the same average kinetic energies.

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A superconductor performs best at??
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very cold temperatures

Explanation:

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3 years ago
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Naily [24]

All of the above

Explanation:

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3 years ago
Suppose you begin with 1.50~g of the hydrate copper(II)sulfate · x-hydrate (CuSO4· x H2O), where x is an integer. After dehydrat
chubhunter [2.5K]

These are two questions and two answers.

Question 1.

Answer: x = 5

Explanation:

1) Data:

m₁ = 1.50 g

compound₁: CuSO₄· x H₂O

m₂ = 0.96g

compound₂ = CuSO₄

x = ? (round to the nearest integer)

2) Solution:

i) molar mass of CuSO₄ = 63.546g/mol + 32.065g/mol + 4×15.999g/mol = 159.607g/mol

ii) number of moles of CuSO₄

number of moles = mass in grams / molar mass = 1.50 g/ 159.607 g/mol = 0.006265 mol

iii) molar mass of H₂O = 18.015 g/mol

iv) mass of H₂O = 1.50g - 0.96g = 0.54g

v) number of moles of H₂O = mass in grams / molar mass = 0.54 g / 18.015 g/mol = 0.0300 mol

vi) Ratio moles H₂O / moles CuSO₄ = 0.0300 / 0.0062625 ≈ 5

∴ x = 5.

Question 2.

Answer: 5.5 g

1) Data:

compound₁ = KAl(SO₄)₂ · 12H₂O.

compound₂ = KAl(SO₄)₂

m₂ = 3.0 g KAl(SO₄)₂

m₁ = ? (two significant figures)

2) Solution:

i) molar mass of KAl(SO₄)₂ = 39.098g/mol + 26.982g/mol + 2×32.065g/mol + 8×15.999g/mol = 258.202

ii) number of moles of KAl(SO₄)₂ = mass in grams / molar mass = 3.0g / 258.202 = 0.011619 mol

iii) number of moles of H₂O = 12 × number of moles of KAl(SO₄)₂ = 12 × 0.011619*12 mol = 0.1394 moles

iv) mass of H₂O = number of moles × molar mass = 0.1394 moles × 18.015 g/mol = 2.5 g (rounded to two significant figures)

v) mass of the original compound = mass of KAl(SO₄)₂ + mass of H₂O = 5.5g

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Why is silicon used to make PV cells
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Silicon is used in producing Pv celss because cells made ​​from the crystallized polycrystalline silicon have efficiencies in the range of 14-18% and a moderate price.
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