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Xelga [282]
3 years ago
5

Which additional claim can be BEST supported by the evidence from the skulls in the whale fossil record?

Chemistry
2 answers:
Vladimir [108]3 years ago
8 0

Answer:

d

Explanation:

Ne4ueva [31]3 years ago
7 0

Answer:

B

Explanation:

I think it is B because it starts out with it's nostrils so it is on the mouth causing it not to be able to breathe but over time it's nostril moved to the top of the head so they could breather better

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2 C6H14 + 19 O2 --> 12 CO2 + 14 H2O
Rashid [163]

Answer:

4.06 mol H₂O

Explanation:

  • 2C₆H₁₄ + 19O₂ → 12CO₂ + 14H₂O

First we <em>convert the given masses of reactants into moles</em>, using <em>their respective molar masses</em>:

  • 250 g O₂ ÷ 32 g/mol = 7.81 mol O₂
  • 50 g C₆H₁₄ ÷ 86 g/mol = 0.58 mol C₆H₁₄

Now we <u>calculate how many O₂ moles would react completely with 0.58 C₆H₁₄ moles</u>, using the <em>stoichiometric coefficients of the reaction</em>:

  • 0.58 mol C₆H₁₄ * \frac{19molO_2}{2molC_6H_{14}} = 5.51 mol O₂

As there are more O₂ moles than required (7.81 vs 5.51), O₂ is the reactant in excess. That means that <em>C₆H₁₄ is the limiting reactant</em>.

Now we can <u>calculate how much water can be formed</u>, using <em>the number of moles of the limiting reactant</em>:

  • 0.58 mol C₆H₁₄ * \frac{14molH_2O}{2molC_6H_{14}} = 4.06 mol H₂O
5 0
3 years ago
The pressure of Cl2 gas in a 2.0-L cylinder is 300. kPa at 25°C. What is the pressure (in kPa) when this gas is released into a
Veronika [31]

The Final Pressure of the gas is 6 kPa

<h3>What is Boyle's Law ?</h3>

At constant Temperature , the absolute pressure exerted by the gas is inversely proportional to the volume of the gas.

\rm P_1V_1 = P_2V_2

It is given that

\rm P_1 = 300k.Pa\\T_1 = 25 \; Degree\\V_1 = 2L\\V_2 = 100L\\T_2 = 25 Degree\\P_2 = ?

To determine Final Pressure , Boyle's Law will be applied

300 * 2 = P₂ * 100

P₂ = 300 * 2 / 100

P₂ =6 kPa

Therefore the Final Pressure of the gas is 6 kPa.

To know more about Boyle's Law

brainly.com/question/1437490

#SPJ1

4 0
2 years ago
Dfine chemical reaction​
allsm [11]

Answer:

A process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.

Explanation:

Pretty much just not a physical reaction or otherwise

4 0
3 years ago
Will it float or sink?
spayn [35]

Answer:

depends

Explanation:

if there was a picture i could help you

3 0
4 years ago
Read 2 more answers
Explain how you can convert from the number of representative particles of a substance to moles of that substance.
Scrat [10]

Answer:

  • the number of representative contain in 1 mol of a substance equals to 6.o2x10^23 particles.
8 0
3 years ago
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