You perform a combustion analysis of 0.255g of a compound that contains C, H and O. You produce 0.561 g of CO₂ and 0.306g of H₂O.

A. How many grams of carbon and hydrogen did you produce?

a)0.154g C & 0.034g H b)0.225g C & 0.068g H c)0.0128g C & 0.017g H d)0.306g C & 0.278g H

B. How many grams of oxygen were there in the original compound?

a)0.081   b)0.091  c)0.055 d)0.067

C. What is the empirical formula of the compound?

a)C2H602 b)C3H8O2   c)C3H8O d)C3H6O

How many grams of oxygen were there in the original compound?

(i) The unbalanced chemical equation for the reaction to form Ag₂[Cr₂O₇] is

Cr³⁺ + S₂O₈^2- +H₂O + AgNO₃ → Ag₂[Cr₂O₇] + SO₄^2- + H⁺ + NO₃^-

Balance the equation and determine which atoms were oxidised and which were reduced in the reaction.

(ii) The unbalanced chemical equation for the reaction to form K₃Cr(O₂)₄ is

K₂CrO₄  + H₂O₂ + KOH → K₃Cr(O₂)₄ + H₂O

Balance the equation. Show which atoms were oxidised and which atoms were reduced.

Which of the following is an empirical formula?

a. C2H6

b. C3H8

c. C4H10

d. C6H6

Please explain!:) Thank you for your help!!!

Account for the following observations:

The NH2CH2CH2CH2NH2 is a good bridging ligand, but it is not a bidentate chelate ligand.

Syrup is made of equal parts of water and sucrose. Mass of 1 cup of sucrose is 200.0g and mass of 1 cup water is 220g. what temperature will the syrup boil and freeze?

A buffer consists of 0.91-M propanoic acid ( Ka= 1.4 × 10^-5) and 0.76-M sodium propanoate.

a) Calculate the pH of this buffer.

b)Calculate the pH after the addition of 1.2 mL of 0.10–M HCl to 0.010 L of the buffer.

c) Calculate the pH after the addition of 1.8 mL of 1.0–M HCl to 0.010 L of the buffer.

Clearly and completely describe a simple, ONE step (a single reagent added) test that would allow you to distinguish between the following:
a) Bi(OH)3 and Al(OH)3

b) Pb2+(aq) and Fe3+(aq)

Consider a helium ion He+.

a) Find the ratio between the ionization energy of the H atom and and the He^+ ion.

b) How does the Bohr radius, we defined for H atom, differ for He^+ ? Using the Bohr radius of He^+ and the representation of the ground state wave function for the H atom, write the ground state wave function for the He^+.

c) Find the average distance of a 1s electron from a nucleus in He+ ion. How does it compare with the Bohr radius you found in (b) for H atom and He^+ ion?

d) Find the most probable value of r characterizing the distance between a 1s electron and the nucleus in the He^+ ion. Compare your answer with (c) and discuss a physical meaning of obtained results.

e) Find the average distance of 2pz electrons from a nucleus in He+ ion. Compare your results with those for a 1s electron in (c). Are you surprised by the answer?

f) How your answer in (e) would be different, if you find the average distance of 2px electrons, instead of pz?

The pH of a 0.392 M solution of the conjugate base, A-, of a weak acid, HA, is 11.60. What is the K_b for A-?

Please show work

Other then a COUNTERFEIT DETECTION PEN , HOW chemistry is being used in money detection and WHAT other chemical application can be used to prevent counterfeit currency from circulation.

At 1177 K the partial pressures of an equilibrium mixture of H2O, H2 and O2 are 0.0340, 0.0035 and 0.0013 atm, respectively. Given that the chemical equation for the equilibrium is, 2 H2O(g) <----> 2 H2(g) + O2(g) calculate Kp and Kc.

1) Oxidation refers to...
a) an increase in Oxidation number. b) a decrease in Oxidation number. c)an increase in atomic number. d) an increase in mas.