what is the density of 80 gram of a substance occupying a volume of 250 c.m cube at 25°C and 1 atmosphere?

Density = 0.32g/mL

Explanation:

Density of a substance can be calculated using the formula:

Density (g/mL) = mass (g)/volume (mL)

According to the information provided in this question, mass of the substance = 80grams, volume = 250cm³/mL

Note that, the pressure and temperature are not needed to calculate the density of the substance.

Density = 80/250

Density = 0.32g/mL

436.88 moles of P₄O₁₀

Explanation:

From the question given above, the following data were obtained:

Number of molecules of P₄O₁₀ = 2.63×10²⁶ molecules​

Number of mole of P₄O₁₀ =?

From Avogadro's hypothesis,

6.02×10²³ molecules = 1 mole of P₄O₁₀

Therefore,

2.63×10²⁶ molecules​ = 2.63×10²⁶/6.02×10²³

2.63×10²⁶ molecules​ = 436.88 moles of P₄O₁₀

Thus, 436.88 moles of P₄O₁₀ are present in 2.63×10²⁶ molecules.