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2 years ago

Why can characteristics properties be used to identify unknown substances

Chemistry

1 answer:

frozen [14]2 years ago

5 0

Characteristic properties are used because the sample size and the shape of the substance does not matter.

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How many hydrogen atoms are contained in 167 grams of propane?

Dmitry_Shevchenko [17]

Propane is C3H8

So Molar mass propane = 3*12 + 8*1 = 44 
No. of moles of propane = 167/44 = 3.795 moles

From the stoichiometry: 
No. of moles of hydrogen = 3.795 moles * (8 moles hydrogen / 1 mole propane) = 30.36 moles

Using Avogadros number, 1 mole of any substance contains 6.022 x 10^23 atoms, therefore:
No. of hydrogen atoms = 30.36 * 6.022 x 10^23 = 1.828 x 10^25 atoms

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2 years ago

What qualifications do you need to be a research scientist?

il63 [147K]

Answer:

B and D

Explanation:

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3 years ago

Which of the following elements has the largest atomic size? S, Ba, Po, Ca

prohojiy [21]

Answer:

Ba has the largest atom size

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3 years ago

Read 2 more answers

Which property is NOT used to separate a mixture?

NeTakaya

Answer: ability to undergo a chemical reaction

Explanation:

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3 years ago

Complete combustion of 2.0 metric tons of coal to gaseous carbon dioxide releases 6.6X10¹⁰ J of heat. Convert this energy to

Jobisdone [24]

6.6 × $10^{10}$ J = 6.2 × $10^{7}$ British thermal units

First of all, we should know that 1 British thermal unit = 1055 Joules.

From question, heat = 6.6 × $10^{10}$ J

1 BTU = 1055 J

6.6 × $10^{10}$ J = $\frac{1}{1055}$ × 6.6 × $10^{10}$ British thermal units

= 6.2 × $10^{7}$ British thermal units

1000 Joules = 1 kilojoule

A kilojoule is a unit of measure of energy, in the equal way that kilometers degree distance. meals energy used to be measured in energy and some international locations still use those gadgets.

The power we get from foods and drinks is measured in kilojoules. that is the metric time period for calorie. Kilojoules and energy constitute the equal aspect. One calorie is ready four kilojoules.

Calorie a unit for measuring warmth same to the quantity of warmth required to elevate the temperature of one gram of water one diploma Celsius.

Learn more about kilojoules here :- brainly.com/question/490326

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1 year ago