Which of the following is true for compounds?

If the edge length of the unit cell is 705.2 pm, what is the density of KI in g/cm3.

Kipish [7]

The density is 3.144 g / cm^3.

<u>Explanation</u>:

If effective number of atom in NaCl type structure, z = 4

a = 705.2 pm ⇒ In centimeter = 705.2 $\times$ 10^-10

Na = 6.023 $\times$ 10^23

density = (molecular weight) (z) / (Na) (a^3)

where molecular weight of KI is 166 g,

Z represents the atomic number

density = (molecular weight) (z) / (Na) (a^3)

= (166 $\times$ 4) / (6.023 $\times$ 10^23) $\times$ (705.2 $\times$ 10^-10)

density = 3.144 g / cm^3.

5 0

2 years ago

According to the second law of thermodynamics, energy tends to become more spread out. True or False?

chubhunter [2.5K]

The answer is true. According to the second law of thermodynamics, energy tends to become more spread out

8 0

2 years ago

#1: Which of the following is an exothermic reaction?

aleksandrvk [35]

<span>An exothermic reaction is one in which heat is released from the reagents into the ambient environment. Perhaps somewhat counterintuitively, condensation is in fact an example of such a reaction. During the process of the gas-to-liquid phase change, water goes from a higher-energy to lower-energy state of matter, and, as such, releases heat into the environment.</span>

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2 years ago

Calculate the percent composition of Ca3P2

Afina-wow [57]

Calculate the molar mass of Ca3P2 in grams per mole or search for a chemical formula or substance.

8 0

2 years ago

Read 2 more answers

Octane has a density of 0.692 g/ml at 20∘c. how many grams of o2 are required to burn 17.0 gal of c8h18

german

156251.099 grams of O₂ are required to burn 17.0 gal of C₈H₁₈

<h3>Further explanation</h3>