Arock has a mass of 12000 g. it contains 300.0 grams of gold. what is the mass percent of gold in the rock? 25.00% 4.000% 2.500% 100.0%

The mass percent of gold in the rock is 2.500 %

Explanation:

Step 1: Data given

Mass of the rock = 12000 grams

Mass of gold = 300.0 grams

Step 2: Calculate mass %

Mass % = mass of gold / mass of gold

Mass % = (300.0 grams / 12000 grams) * 100 %

Mass % = 2.500 %

The mass percent of gold in the rock is 2.500 %

answer: option (b) is the correct answer.

explanation:

a covalent bond is formed by sharing of electrons. whereas polarity arises due to difference in electronegativity of two atoms.

therefore, more is the electronegativity of an atom which combines with the titanium, more readily it will induce a partial positive and negative charge.

thus, out of the given options fluorine is most electronegative and has an incomplete octet. therefore, it will readily combine with titanium to share the electrons and complete its octet.  

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is and electronic configuration of phosphorous is .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.  

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.