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4 years ago

Every substance melts at 0 degrees Celsius and boils at 100 degrees Celsius.

2 answers:

6 0

Hello! It is true that water boils at 100% C, however, this is not true for any substance. Take steel, for instance, steel would take MUCH higher temperatures to melt, and to boil. As it says "ANY SUBSTANCE" this would be false.

I hope this helped!

I am, yours most sincerely,
SuperHelperThingy

Gnom [1K]4 years ago

4 0

False, that only applies to water as far as I know, but I know for a fact that gold does not melt at 0 degrees Celsius

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2 Fe2S3 +902 - 2 Fe2O3 + 6 SO2

maksim [4K]

Answer:

3.93 mol

Explanation:

The balanced equation is given as;

2 Fe₂S₃+ 9 O₂ --> 2 Fe₂O₃ + 6 SO₂

From the reaction;

2 mol of Fe₂S₃ reacts with 9 mol of O₂ to form 6 mol of 6 SO₂

This means;

1 mol of Fe₂S₃ requires 9/2 mol of O₂

Also,

1 mol of O₂ requires 1/9 mol of Fe₂S₃

In the question, we have;

1.31 moles of Fe2S3 and 22.8 moles of O2

The limiting reactant which determine how much of the product formed is; Fe₂S₃ because O₂ is in excess.

The relationship between Fe₂S₃ and SO₂ is;

2 mol Fe₂S₃ produces 6 mol of SO₂

1.31 mol of Fe₂S₃ would produce x mol ?

2 = 6

1.31 = x

x = 6 * 1.31 / 2 = 3.93 mol

8 0

3 years ago

What are 3 examples of pairs of atoms with polar covalent bonds?

mezya [45]

Answer:

Water - H2O

Ammonia - NH3

Sulfur dioxide - SO2

Hydrogen sulfide - H2S

Ethanol - C2H6O

Explanation:

Those are some atoms with polar covalent bonds. Hope this helps!!

8 0

4 years ago

I GIVE 40 POINTS PLZ ANSWER

ratelena [41]

Answer:

1 M C6H1206s

1 M NaNO3

1 M Ca(NO3)2

1 M Li3PO4

Explanation:

Hope it helps!

5 0

3 years ago

Enter an equation to show how h2po3− can act as a base with hs− acting as an acid

jek_recluse [69]

The base is the species that accept hydrogen, and the acids donate hydrogen ions. Dihydrogen phosphite acts as a base and hydrosulfide sulfanide act as an acid.

<h3>What are acids and bases?</h3>

Acids are molecules or chemical species that can donate a proton or a hydrogen ion to another chemical species.

Bases are the ions or molecules that accept a proton or hydrogen ion and release a hydroxide ion.

The acid and base relationship is shown as,

$\rm H2PO_{3}^{-} + HS^{-} \leftrightarrows S^{-} + H_{3}PO_{3}$

Learn more about acids and bases here:

brainly.com/question/26821614

#SPJ4

7 0

2 years ago

How many capsules containing 75mg of Tamiflu could be produced from 155g of star anise.?

jeyben [28]

From the question you will find that:
one capsule of tamiflu is obtained from 2.6 g of star anise.
1 capsule = 2.6 g tamiflu
? capsules = 155 g tamiflu
by cross multiplication = $\frac{(1 x 155)}{2.6}$ = 59 capsules

7 0

4 years ago