Answer:
27.0
Explanation:
Because Mass can neither be created nor be destroyed hence total mass of sample of iodine and tube remain equal as it is sealed.
The correct Lewis structure for Fluorine is A.
Answer:
B) 2
Explanation:
Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.
The rule apply for the multiplication and division is :
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
The rule apply for the addition and subtraction is :
The least precise number present after the decimal point determines the number of significant figures in the answer.
(3.478-2.31) = 1.168 ≅ 1.17 (Rounded to least decimal digit)
(4.428-3.56) = 0.868 ≅ 0.87 (Rounded to least decimal digit)
So,
1.17 * 0.87 = 1.0 (Rounded to least significant)
Answer - two significant digits
Answer:
Option c. It contians ionic bonds
Explanation:
Let's take as an example NaCl
An element from group 1 (alkali) with an halogen.
Elements from group 1 form cations with +1 (charge)
This ionic salt, can't never has the formula XZ₂
Ionic salts, also can be dissolved in water, and they don't contain covalent bonds.
Answer:
67.88% is the percent yield.
Explanation:
Moles of methane = 
According to reaction,1 mole of methane gives 1 mole of carbon dioxide gas, then 3.75 moles of methane will give :
of carbon dioxide gas
Mass of 3.75 moles of carbon dioxide gas:
3.75 mol × 44 g/mol = 165 g
Theoretical yield of the carbon dioxide gas = 165 g
Experimental yield of the carbon dioxide gas = 112 g
The percentage yield of the reaction :
67.88% is the percent yield.
