Answer:4 significant figures
Explanation:
The answer is B 2. As it says Atom Number of Protons and Number of Neutrons, from my understanding it means that the first number after the letter is the number of protons and the second number is the number of neutrons.
Now, If there are 6 protons in a nucleus that means there are 6 electrons on the outside, so A and D are the same element. However, you may be confused because of the different number of neutrons (6 and 7 or 7 and 8) this only means that one is and isotope of the element.
*Isotopes are atoms with the same number of protons but different number of neutrons. (Basically, same element different mass)
Answer:
Hydrogen bonds are totally different to both covalent bonds and ionic bonds. Hydrogen bonds are intermolecular bonds, that means they occur in between two molecules. ... When H atom is close to O,F, N atoms those atoms can attract H atoms electrons temporarily, thus making a weak bond.
Explanation:
Answer:
5.3072 Liters of volume of ethanol is required.
Explanation:
Volume of isooctane = 1 gal = 3.785 L
3.785 L =3.785 × 1000 mL= 3,785 mL
Energy density of isooctane = 32.9 kJ/mL
Energy produced on combustion of 3,785 mL of isooctane :
Moles of ethanol which will produce same amount of energy 'E' as 1 gallon of iosooctane = n
Ethanol’s enthalpy of combustion = 
Energy released when 1 mole of ethanol is combusted = 1,368 kJ/mol
n = 91.03 mole
Mass of 91.03 moles of ethanol , m= 91.03 mol × 46 g/mol = 4,187.38 g
Volume of ethanol = V
Density of ethanol = d = 0.789 g/mL
5.3072 Liters of volume of ethanol is required.
