Chemistry

Determining H-NMR signals

In my organic chemistry answer book it says that CH3CH2CO2CH2CH3 has 4 different Hydrogens and therefore 4 NMR signals and CH3CH2OCH2CH3 has 2 NMR signals. I thought that both molecules would have had

How many mcg equal an mL

How many mcg equal an mL if 200mcg/ml, 30ml?-200mcg / ml means 200mcg per ml.In other words, 1 ml has 200mcg. In 30ml, there are 200x30 mcg.

Use the ΔH°f information provided to calculate ΔH°rxn for the following:

ΔH°f (kJ/mol)SO2Cl2 (g) + 2 H2O(l) → 2 HCl(g) + H2SO4(l) ΔH°rxn = ? SO2Cl2(g) -364 H2O(l) -286 HCl(g) -92 H2SO4(l) -814 Thanks for any help!-It isnt difficult to come to this conclusion (basically, t

Help with easy problem

I am embarrassed that I cannot figure this out. Lithium has only two naturally occurring isotopes. The mass of lithium-6 is 6.01512 (amu) and the mass of lithium-7 is 7.01601 (amu).Use the atomic mas

What is the molarity of K+ ions in a 1.25 M solution of K2SO4

What is the molarity of K+ ions in a 1.25 M solution of K2SO4? How would I go about solving a problem of this nature?Thank you for all help!-M= mol/ L 1.25 M K2SO4 = 1.25M K2 = 1.25 mol K2 (1.25mol

PLEASE HELP Chem Question

Given the reaction at 101.3 kilopascals and 298 K: hydrogen gas +iodine gas →hydrogen iodide gas This reaction is classified as (1) endothermic, because heat is absorbed (2) endothermic, because

Can you please name this molecule

Can you please name this molecule? HHHH|||| H - C = C - C - C - OH||HH Molecular Formula: C4H8O.-2-methyl-2-propen-1-ol-I name it Cindy !!

Why is gas cheaper than electricity (example gas dryer versus electric dryer)

think about how electrcity is produced. in some cases, gas is burned. the efficiency of that process is typically 40-45%. the efficiency in your dryer for both gas and electric is close to 100%, but t

What are these Word equations and symbol equation

Zinc + nitric acid - > Iron(ii) + hydrochloric acid -> Calcium + Water -> Alumnium + Sulfuric acid - > PLEASE~~ Thankyouu ~~~~ ^^ The symbol equation can be added ~~ but its okay ~ (:-Zinc + Nitr

CHEMISTRY HELP!!!!!!

A gas X dissociates on heating to set up the following equilibrium: X(g)--> Y(g) + Z(g) A quantity of X was heated at constant pressure, p, at a certain temperature. The equilibrium partial pressure o

Question of chemistry!!! Please, help me!!!!

The question is long and not easy, but here it comes: A microtone is an instrument used to cut very thin, consecutive sections through a tissue so that the tissues component cells may be examined und

I need help calculating the pH ? :D

Calculate the pH of blood with a H+ concentration of 60 nmol/L. Identify the acid-base disorder of a patient with this pH (RR 7.35-7.45) who has a bicarbonate of 15 mmol/L (RR 22-32) and a PCO2 of 52

How tell what group by the ionization energy

how do i know what group the element belongs to if im only given its ionization energy lets say I had 7.64615.03580.143 what group would this element be i heard you can find its valence by the jump of

Stoichiometry will you help please

1)N & O form series of oxides with general formula NxOy.One of them contains 36.84% of N,what is empirical formula of this oxide? 2)A sample of indium chloride weighing 0.5000 g is found to contain

What is the chemical change when paper is burnt

When paper is burnt, ____ and ____ is released-Paper is celulosis, it decomposes into CO2 + H2O. C6H12O6 + 6O2 --> 6CO2 + 6H2O-when paper is burnt, IT IS AN EXOTHERMIC REACTION and HEAT is released