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Final answer:

The mass in grams of 2.56x10-3 mol of iron is 0.143 g.

Explanation:

To calculate the mass in grams of 2.56x10-3 mol of iron, you need to use the molar mass of iron. The molar mass of iron is 55.845 g/mol. To find the mass in grams, you can use the following step-by-step calculation:

Mass (g) = Number of moles x Molar mass

Mass (g) = 2.56x10-3 mol x 55.845 g/mol = 0.143 g

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Answer:

Option (A)

Explanation:

Radioactivity is defined as a process in which an unstable atomic nucleus decays continuously and after a specific period of time changes into a much more stable element. During this time of decay, the nucleus emits charged particles (energy) which are known as the α, β and γ particles. These are often emitted in the form of electromagnetic energy and are very dangerous to health.

The radioactive elements decay at a certain rate which is commonly known as the half-life. Half-life is basically defined as the time required by a radioactive substance to decay half of its initial composition.

Thus, the correct answer is option (A).

Answer:

Cobalt is indeed a metal, and its atoms exhibit certain characteristics and interactions with other cobalt atoms. Here are some key features:

Atomic Structure: The cobalt atom has an atomic number of 27, meaning it has 27 protons in its nucleus. It also typically contains 27 electrons, arranged in energy levels or shells around the nucleus. The electron configuration of cobalt is [Ar] 3d^7 4s^2.

Magnetic Properties: Cobalt is known for its magnetic properties. At room temperature, it is ferromagnetic, meaning it can be permanently magnetized. This is due to the arrangement of electrons in its outermost energy levels.

Metallic Bonding: In solid cobalt, metallic bonding occurs. Metallic bonding involves the sharing of electrons between atoms within a metal lattice. In cobalt, the outermost electrons are relatively free to move throughout the metal structure, forming a "sea" of delocalized electrons. This contributes to the metal's electrical and thermal conductivity.

Alloy Formation: Cobalt readily forms alloys with other metals. Common examples include cobalt-chromium (Co-Cr) and cobalt-nickel (Co-Ni) alloys. These alloys often exhibit enhanced strength, hardness, and resistance to corrosion.

Coordination Chemistry: Cobalt is known to form coordination complexes due to its ability to act as a Lewis acid. It can form bonds with ligands, which are typically molecules or ions with lone pairs of electrons. These complexes play a crucial role in various chemical reactions, including catalysis.

Oxidation States: Cobalt can exist in different oxidation states, including +2, +3, and +4. The +2 oxidation state is the most common for cobalt and is stable in many compounds. Cobalt compounds with different oxidation states exhibit diverse chemical and physical properties.

Overall, cobalt atoms in metallic cobalt interact through metallic bonding, while cobalt in compounds can participate in coordination chemistry and exhibit different oxidation states, leading to a wide range of applications and reactivity.

Explanation:

Answer:

what problem?

Answer:

Distillation

Explanation:

In order to turn seawater into freshwater you have to remove the dissolved salt in seawater. That may seem as easy as just boiling some seawater in a pan, capturing the steam and condensing it back into water (distillation).