General Chemistry Answers

Please help me with the explanation of the Latin Square Method for interpreting the results in bioanalysis

P4O10

What is the pH of a 1.15 M solution of methanoic acid? K_a = 1.8 x 10^-4

What is the pH of a 0.350 M solution of lithium citrate? (Ka Citric Acid = 7.4 x 10^-4 )

A 50.0 mL solution of 0.150 M acetic acid (CH3COOH) is titrated with 0.150 M NaOH.

What is the pH after 20.0 mL of base has been added? Ka CH3COOH = 1.8 x 10^-5

1. The airbag is a safety device used in cars to cushion the passenger during a crash. It involves the following chemical reaction which is triggered by an impact:

2 NaN_{3 (s)} → 2 Na_(S) + 3N_{2 (g)}

       Calculate the volume of N₂ gas (measured in STP) that can be produced from 130.0 g of NaN_3.

1. How many liters of O_{2 (g)} at STP is needed yo completely burn 20.0 L of butane (C₄H₁₀), with this reaction?

2 C₄H_{10 (g)} + 13 O_{2 (g)} → 8 CO_{2 (g)}  + 10 H₂O _(l)

1. Acetylene is formed by the reaction of water with calcium carbide, according to the following equation:

CaC_{2 (s)} + 2H₂O _(l) + Ca(OH)_{2 (aq)} → C₂H_{2 (g)}

   How many grams of CaC₂ would be needed to produce 10.0 L (at STP) of acetylene

An amount of 0.450 mole of an unknown hydrocarbon was subjected to combustion. The process produced 980.0 mL of CO2 at STP.

a. Find the volume of CO2 formed at STP from one mole of the unknown hydrocarbon.

b. Compute the number of carbon atoms present in one molecule of the unknown hydrocarbon.

In the manufacture of sulfuric acid, sulfur dioxide is converted to sulfur trioxide using a catalyst of vanadium(V) oxide: 

2SO₂(g) + O₂(g)  2SO₃(g) 

The electronic configuration of vanadium is [Ar] 3d³ 4s², so the mechanism for this reaction is most likely to involve a sequence in which vanadium(V) is converted to 

Calculate the wavelength of the following “particles”:

(a) A 6.00 x 10-2 kg tennis ball traveling at 68 m/s

(b) An electron moving at the same speed

It is a type of coal that has the highest moisture content and volatile content