Rank the four gases (air, exhaled air, gas produced from from decomposition of H2O2, gas from decomposition of NaHCO3) in order of increasing concentration of oxygen).

Answers

Answer 1

Answer: The concentration in this case will be expressed as mole oxygen per mole compound or mixture. In air, there are 42 moles of oxygen per 100 moles air. In exhaled air, there are 32 moles Oxygen per 100 moles ex. air. The decomposition of h2o2 results to 2 moles h2O and 1 mole oxygen. Hence there are 4 mole oxygen per 7 moles product.The decomposition of NaHCO3 results ot Na2CO3, Co2 and H20. there are 6 moles pxygen per 12 moles atoms. The ranking (increasing to decreasing) is decomposition of H2O2, decomposition of NaHCO3, air, and exhaled air.

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How many moles of water, H2O, contain 2.0×10^22 molecules of water?

Answers

1 mol H₂O ----------- 6.02x10²³ molecules
? mol H₂O --------- 2.0x10²² molecules

Number of moles = Number of molecules / Avogadro's number

moles = 2.0x10²² * 1 / 6.02x10²³

= 2.0x10²² / 6.02x10²³

= 0.3322 moles

hope this helps!

What type of measurement is indicated by g/mL ?

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Answer:

grams per milliliter.

Explanation:

While any units of mass and volume can be used to calculate density the most common are grams (g) and milliliters (ml). This gives density the units of grams per milliliter (g/ml).

Nonmetals make up the largest grouping of elements on the periodic table. answer True or False

Answers

false, nonmetals do not make up the largest grouping of elements on the periodic table

The answer is false metals make up the largest group

How would you prepare 3.5 L of a 0.9M solution of KCl?

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Calculate the mass of the solute in the solution :

Molar mass KCl = 74.55 g/mol

m = Molarity * molar mass * volume

m = 0.9 * 74.55 * 3.5

m = 234.8325 g

To prepare 0.9 M KCl solution, weigh 234.8325 g of salt in an analytical balance, dissolve in a beaker, shortly after transfer with the help of a funnel of transfer to a volumetric flask of 100 cm³ and complete with water up to the mark, then cover the balloon and finally shake the solution to mix

hope this helps!

The combustion of fossil fuels releases ____ into the atmosphere. oxygen

gasoline

carbon

glucose

Answers

Answer: The correct answer is carbon.

Explanation:

Combustion reaction is defined as the reaction in which a hydrocarbon burns in oxygen or reacts with oxygen gas to produce carbon dioxide and water molecule.

Fossil fuels are defined as the hydrocarbons which mainly contains coal, fuel oil, natural gas etc..

When fossil fuels are burned in air, it mainly releases carbon dioxide, sulfur dioxide, methane, nitrous oxide etc..

The major component released during the combustion of fossil fuels is carbon.

Hence, the correct answer is carbon.

CARBON because fossil fuells

Is glucose an pure substance or mixture?

Answers

a pure substance hope this helped

yes glucose is a pure substance

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