Chemistry

Chemistry question relating to combustion for homework

The combustion of ammonia in the presence of excess oxygen yields NO2 and H20: 4 NH3(g) + 7 O2(g) ---> 4 NO2(g) + 6 H2O(g) The combustion of 28.8g of ammonia consumes _______ g of oxygen. A)15.3B)94

Gas stoichiometry......

P4(s) + 5O2(g) -----> P4O10(s) How many grams of phosphorus react with 6.599 x 101 L of oxygen (O2) at STP (standard temperature and pressure) to form tetraphosphorus decaoxide?-What volume of O2 do

Is General Chemistry difficult

I plan on taking General Chemistry next semester. I am currently attending a community college and wonder if that makes any difference for its difficulty. They have a developmental Chemistry class Im

Excess and limiting reactant problem

Im having a dispute with friends about this question 4HCl(g) + O2(g) --> 2H2O(l) + 2Cl2 (g) All gases are measured at constant temperature and pressure. If 40.0 mL of HCl reacts with 30.0 mL of O2 w

I love chemistry but suck at math

I want to further my education in Chem but Im not good at math. Im afraid I will fail because of that. I dont mind working hard. What math should I really focus on? Im not sure if Im really bad at mat

Calculating with percent composition

Can anyone help me how to get this? Im soo confused What is the mass of mercury found in 3.5 kg of an ore that is 35.0% mercury (II) sulfide? (Answer: 1100) Help me please T.T-3.5 kg x (1000 g / kg)

How to find the empirical formula

Ok, this is a section from my lab report. Skim through it briefly: First off, set up a Bunsen burner to be able to hold an evaporating dish. Find the mass of the evaporating dish, and record that mas

Calculate the number of moles in this problem

3.01 x 10^23 atoms of zinc? can you explain how to do this also how many protons are in 648.7 g of krypton?-3.01 x 10^23 atoms Zn x (1 mol / 6.02 x 10^23 atoms) = 0.500 mol Zn 648.7 g Kr x (1 mol /

Calculate the delta H rxn of the following reaction? Need to figure this out by tonight please!

I dont even know where to start with this question. Somebody help please? If you can help with either one thatd be great. Thanks in advance! 2. Calculate DeltaHrxn for the following reaction: CH4(g)

What are the 7 ketones with formula C6H12O

I only know 6 of them: CH3COCH2CH2CH2CH3 CH3CH2COCH2CH2CH3 CH3CH(CH3)COCH2CH3 CH3CH(CH3)CH2COCH3 CH3C(CH3)2COCH3 CH3COCH(CH3)CH2CH3 Whats the seventh ketone?-Those are the only structural isomers tha

Chemistry Help? Naming SnS2

Okay, so I think the answer is Tin Sulfide, but I looked online and a ton of websites said it was Tin (IV) Sulfide. I understand the rule about using Roman Numerals to state the cations charge, but

AP Chem help please!!!!!! redox rxns

got this question completely wrong on an AP Chem test, but i can do corrections, i just need to be able to explain how i found the answer. But i am so confused. I think i mixed up oxidizing and reduci

Calculate the pH of a buffer solution....help

Calculate the pH of a buffer solution prepared by dissolving 4.2 g of NaHCO3 and 5.0 g of Na2CO3 in 0.20 L of water.-Calculate moles of NaHCO3 and moles of Na2CO3 used. Divide each by 0.200 L to calcu

What changes in the atomic number and mass number occur in each of the following types of radioactive decay

a.alpha emission b.beta emission c.positron emission d.electron capture God bless :D-a. atomic #: -2, Mass #: -4 b. atomic #: +1, Mass #: no change c. atomic #: -1, mass #: no change d. atomic #: -1,

What are the ionic and net ionic equations of the following molecular equations

1.) 2Mg (s) + HCl (aq) --> MgCl2(aq) + H2 (g) 2.) Pb(NO3)2 (aq) + 2KI (aq) --> PbI2 (s) + 2KNO3 (aq) 3.) 8Fe (s) + S8 (s) --> 8FeS (s)-There is no net ionic equation in 3) because there is nothing i