Giulio M

I need some help working this problem out. Thanks.

Draw the Lewis structure for SO42-. How many equivalent resonance structures can be drawn?

The choices are

a) 2

b) 8

c) 4

d) 3

e) 6

I'd appreciate it if someone could work this problem out for me. Thanks

Use the bond energies provided to estimate DeltaH°rxn for the reaction below.

PCl3(g) + Cl2(g) --> PCl5(l) DeltaH°rxn= ?

Bond / Bond Energy (kJ/mol)

Cl-Cl = 243

P-Cl = 331

A) -419 kJ

B) -905 kJ

C) -67 kJ

D) -243 kJ

E) -662 kJ

Choose the compound below that should have the highest melting point according to the ionic bonding model.

A) NaF

B) AlN

C) RbI

D) CaS

E) MgO

Which of the following elements can form compounds with an expanded octet?

Fluorine

Beryllium

Bromine

Nitrogen

None of these

Which of the following processes are exothermic?

Let me know why you Chose the answer, so I understand it. Thanks.

A) NaF(s) --> Na+(g) + F-(g)

B) Br(g) + e- --> Br-(g)

C) Cl2(g) --> 2Cl(g)

D) Li(s) --> Li(g)

How many unpaired electrons are present in the ground state P atom?

Place the following in order of increasing IE1.

K

Ca

Rb

Give the set of four quantum numbers that represent the last electron added (using the Aufbau principle) to the Cl atom.

A) n = 3, l = 1, ml = 1, ms = + 1/2

B) n = 2, l = 1, ml = 0, ms = - 1/2

C) n = 3, l = 0, ml = 0, ms = - 1/2

D) n = 3, l = 1, ml = 0, ms = + 1/2

E) n = 3, l =1 , ml = 0, ms = - 1/2

How many photons are contained in a burst of yellow light (589 nm) from a sodium lamp that contains 609 kJ of energy?

According to the following balanced reaction, how many moles of NO are formed from 8.44 moles of NO2 if there is plenty of water present?

3 NO2(g) + H2O(l) --> 2 HNO3(aq) + NO(g)

How many atoms of oxygen are contained in 47.6 g of Al2(CO3)3? The molar mass of Al2(CO3)3 is 233.99 g/mol.

Determine the empirical formula for a compound that is 36.86% N and 63.14% O by mass.

A) NO2 B) NO3 C) N2O3 D) N2O E) NO

Combustion analysis of 63.8 mg of a C, H and O containing compound produced 145.0 mg of CO2 and 59.38 mg of H2O. What is the empirical formula for the compound?

A) C3H7O B) C5H2O C) C3H6O D) C6HO3 E) CHO

Calculate the mass percent composition of sulfur in Al2(SO4)3.

How many atoms of oxygen are contained in 47.6 g of Al2(CO3)3? The molar mass of Al2(CO3)3 is 233.99 g/mol.

I'd appreciate it if someone colud answer these questions. Thanks.

1. Write a balanced equation to show the reaction of sulfurous acid with lithium hydroxide to form water and lithium sulfite.

A) H2SO4 (aq) + LiOH (aq) 􀀏 H2O (l) + Li2SO4 (aq)

B) H2S (aq) + 2 LiOH (aq) 􀀏 2 H2O (l) + Li2S (aq)

C) HSO3 (aq) + LiOH (aq) 􀀏 H2O (l) + LiSO3 (aq)

D) HSO4 (aq) + LiOH (aq) 􀀏 H2O (l) + LiSO4 (aq)

E) H2SO3 (aq) + 2 LiOH (aq) 􀀏 2 H2O (l) + Li2SO3 (aq)

2. How many N2O4 molecules are contained in 76.3 g N2O4? The molar mass of N2O4 is 92.02 g/mol.

I'd appreciate it if someone could answer these 2 quesions. Thanks..

1.Which of the following is one possible form of pentane?

A) CH3CH2CH2CH2CH3

B) CH3CH=CHCH2CH3

C) CH3CH2-O-CH2CH2CH3

D) CH3CH2CH2CH2CH2CH3

E) CH3CH2CH2CH2CH2NH2

2. Calculate the molar mass for Mg(ClO4)2.

I'd appreciate it if someone can work these couple of questions out. Thanks

1) How many silver atoms are contained in 3.75 moles of silver?

2) What mass (in kg) does 5.84 moles of titanium (Ti) have?

A 14.01 g sample of N2 reacts with 3.02 g of H2 to form ammonia (NH3). If ammonia is the only product, what mass of ammonia is formed?

Two samples of potassium iodide are decomposed into their constituent elements. The first sample produced 13.0 g of potassium and 42.3 g of iodine. If the second sample produced 24.4 kg of potassium, how many kg of iodine were produced?