Answer:
No. of moles = given mass of compound / Molar mass
Explanation:
Given mass = 10g
Molar mass = (40 + 12 + 3x16) =100g/mol
No of moles of CaCO3 = 10 / 100 =0.1 mol
According to Avogadro’s law –
1 mol of CaCO3 molecules contains 6.022 x 1023 CaCO3 molecules
Hence, 0.1 mol of CaCO3 molecules will contain 6.022 x 1023x 0.1 molecules
i.e. 0.6022 x 1023 or 6.022 x 1022 molecules
This is all I can give
Answer:
Charge= -2.
Gains two electron into the 4p^4 to become 4p^6.
Explanation:
The element in the periodic table/chart that matches with the valence electron configuration is Selenium with full electron configuration of [Ar] 3d^10 4s^2 4P^4 which is a non-metal that is found in group 4 of the periodic table/chart.
Selenium can receive 2 more electrons on the 4p^4 to give a -2(minus 2) ion that is Se^2-.
Selenium can also loose 2 electron from 4s^2 to give a +2 ion that is Se^2+.
Selenium can also loose 2 electrons from 4s^2 and 2 electrons from 4p^4 to form Se^4+.
Selenium can also loose 2 electrons from 4s^2 and 4 electrons from 4p^4 to form Se^6+.
Thus, in order to form a monatomic ion with a charge(we will be making use of the most stable one). Thus, it will gain two more electron since this is easier to become 4s^2 4p^6.
Answer:
The answer to your question is: A.
Explanation:
A. C + 2H₂ ⇒ CH₄ This is the right answer because the equation is balanced and is according to the law of conservation of matter.
B. 2H₂ + O₂ ⇒ NH₃ This option is wrong because in the reactants there is oxygen and it is not in the products.
C. 2Al₂O₃ ⇒ 2Na₂O This equation is not according to the law of conservation of matter, in the reactants there is aluminum and it is not in the products.
D. N₂ + 3H₂ ⇒ P₄O₁₀ This equation is not according to the law of conservation of matter.
It was concluded that different liquids do evaporate at different rates, according to the physical properties of the given substance. Nail polish remover vaporized the quickest, followed by water, salt water, vinegar, orange juice and oil.
Answer:
Titan is mostly made up of ice and rocky material
Explanation:
Titan is mostly made up of ice and rocky material, which is likely divided into a rocky core and several layers of ice.