Explanation

Step 1: Calculate the molar mass of S8

The atomic mass of sulfur (S) is approximately 32 g/mol. The molar mass of S8 = 8 * 32 = 256 g/mol.

Step 2: Calculate the number of moles of S8

Number of moles = mass of S8 / molar mass of S8 = 64 g / 256 g/mol = 0.25 mol.

Step 3: Calculate the number of molecules of S8

Number of molecules = number of moles * Avogadro's number (NA) = 0.25 * NA.

Step 4: Calculate the number of sulfur atoms

Each molecule of S8 contains 8 sulfur atoms. Therefore, the total number of sulfur atoms = 8 * number of molecules = 8 * 0.25 * NA = 2 * NA = 2NA.

Explanation

The verb "consider" is used without "as" when followed by a noun or adjective complement.

"Foolish" is the correct adjective.

Explanation

اسم نکرہ اس اسم کو کہتے ہیں جو کسی غیر معین چیز یا شخص کی نشان دہی کرے، جیسے "پرندہ"۔

بلبل ایک اسم معرفہ ہے کیونکہ یہ خاص پرندے کا نام ہے۔

Explanation

To find acceleration, we use the formula:

a = (v - u) / t

where:

v = final velocity = 15 m/s

u = initial velocity = 10 m/s

t = time = 4 seconds

a = (15 - 10) / 4

= 5 / 4

= 1.25 m/s²

Explanation

Maxwell's equations led to the derivation of the speed of electromagnetic waves, including light.

The speed of light (c) is given by C = 1/√μ₀ε₀, where μ₀ is the permeability of free space and ε₀ is the permittivity of free space.

Explanation

The frequency heard by the observer as the car approaches is given by the Doppler effect formula:

f' = f * (v / (v - v_s))

where f = 500 Hz, v = 340 m/s, and v_s = 20 m/s.

f' = 500 * (340 / (340 - 20))

= 500 * (340 / 320)

= 500 * 1.0625

= 531.25 Hz

Explanation

دعا کو قرآن و حدیث میں عبادت کا مغز قرار دیا گیا ہے۔

حضرت محمد ﷺ نے فرمایا: "الدُّعَاءُ مُخُّ العِبَادَةِ" یعنی "دعا عبادت کا مغز ہے"۔

Explanation

The correct word is "something" because it refers to an unspecified item or drink in this context.

"Something to drink" is the proper expression when offering a drink.

Explanation

The Nearctic region includes North America, where animals like prairie dogs, buzzards, opossums, and mountain lions/dogs are commonly found.

It is one of the major biogeographic realms.

Explanation

The ABO blood group gene is located on chromosome number 9.

It codes for glycosyltransferase enzymes that determine blood type.