WILL GIVE BRAINLIEST ANSWER FOR CORRECT ANSWERS ONLY! I HAVE TIME LIMIT HELP PLEASE
Q5) Consider the combustion reaction between 13 ethane molecules and 42 oxygen molecules. Identify the limiting reactant. (Chapter 3)
A) water
B) ethane
C) none of the above
D )carbon dioxide
E) oxygen

Q7) Determine the molarity of a calcium hydroxide (molar mass: 74.10 g/mol) solution if 34.53 mL of the calcium hydroxide solution is required to neutralize 15.41 mL of a 2.456 M hydrochloric acid (molar mass: 36.46 g/mol) solution.
A)1.096 M
B)none of the above
C)5.480 × 10-4 M
D)0.5480 M
E)1.096 × 10-3 M

Q9) In which of the following orbitals does an electron in a rubidium atom experience the least effective nuclear charge?
A)2p
B)5s
C)7s
D)4d
E)3s

Q10) Using Lewis structures, determine the number of sigma (σ) and pi (π) bonds are there in a carbon dioxide molecule?
A) 1 σ and 2 π bonds
B) 2 σ and 2 π bonds
C) 3 σ bonds
D) 1 σ and 1 π bonds
E) none of the above

Q12) Using the Lewis structures for a carbon dioxide molecule and a carbonate ion, which of the following statements is true?
A) A carbonate ion has two different carbon-oxygen bond lengths, where one of the carbon-oxygen bonds is the same length as the carbon-oxygen bond in a carbon dioxide molecule.
B) A carbon dioxide molecule has two carbon-oxygen bond lengths, where one of the carbon-oxygen bonds is the same length as the carbon-oxygen bond in a carbonate ion.
C) none of the above predictions are true
D) All of carbon-oxygen bonds in a carbonate ion are shorter than the carbon-oxygen bonds in a carbon dioxide molecule.
E) All of the carbon-oxygen bonds in a carbonate ion are weaker than the carbon-oxygen bonds in a carbon dioxide molecule.

Q19) Calculate the number of grams of sodium hydroxide (molar mass: 40.00 g/mol) required to make 50.0 mL of a 0.200 M solution.
A) 0.400 g
B) 0.0100 g
C) none of the above
D) 4.00 x 102 g
E) 10.0 g