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3 years ago

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90 g of 4 ºC water is heated until the temperature is 37 ºC. If the specific heat of water is 4.184 J/g ºC, calculate the amount

of heat energy needed to cause this rise in temperature.

1 answer:

kirill115 [55]3 years ago

5 0

Answer:

?

Explanation:

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Answer all with detail please! Easy for those who have completed chemistry courses!

Zina [86]

a) CH2O

each element can be divided by 2

b) BCl3

the molecule is already in it's empirical formula

c) CH4

the molecule is already in it's empirical formula

d)CH2O

each element can be divided by 6

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3 years ago

Why are fossils not found in igneous or metamorphic rocks?

xenn [34]

Answer:

Because the rock underwent lava and heat/pressure transformation. They are cooled and heated by magma, and then under go pressure. No fossils would be found in those.

Explanation:

Hope this helps! :)

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3 years ago

Read 2 more answers

Estradiol is a female sexual hormone that causes maturation and maintenance of the female reproductive system. Elemental analysi

Harlamova29_29 [7]

Answer:

The answer to your question is: Molecular formula = C₁₈H₂₄O₂

Explanation:

Estradiol

C = 79.37 %

H = 8.88 %

O = 11.75 %

Molar mass = 272.37

Process

Carbon = 79.37 g

Hydrogen = 8.88 g

Oxygen = 11.75 g

12 g of Carbon ----------------- 1 mol

79.37 g ---------------- x

x = (79.37 x 1) / 12

x = 6.61 mol

1 g of Hydrogen ---------------- 1 mol

8.88 g ---------------- x

x = (8.88 x 1 ) / 1

x = 8.88 mol

16 g of Oxygen ------------------ 1 mol

11.75 g ----------------- x

x = (11.75 x 1) / 16

x = 0.73

Divide by the lowest number of moles

Carbon = 6.61 / 0.72 = 9.2

Hydrogen = 8.88 / 0.73 = 12.2

Oxygen = 0.73/0.73 = 1

Empirical formula

C₉H₁₂O₁

MW of the empirical formula = (12 x 9) + (12 x 1) + (16 x 1)

= 136 g

Divide molar mass of estradiol by the molar mass of the empirical formula.

= 272 / 136

= 2

Then the molecular formula is:

2(C₉H₁₂O) = C₁₈H₂₄O₂

7 0

4 years ago

Consider the mechanism. step 1:step 2:overall:2a⟶bb c⟶d2a c⟶dslowfast determine the rate law for the overall reaction, where the

Ne4ueva [31]

Answer:

Rate: R = k [A]²

Explanation:

The rate law equation for a given complex chemical reaction is given as the product of molar concentrations of the reactant raised to the power their respective partial reaction orders. The sum of the partial reaction orders is equal to the overall order of reaction.

For a complex reaction, the rate law is generally determined by the slowest step, which is known as the rate-determining step.

<u>Given reaction mechanism:</u>

Step 1: 2 A⟶ B, slow step

Step 2: B+ C⟶ D, fast step

Overall: 2 A + C ⟶ D

In this given reaction mechanism, the <em>step 1 is the slow step and thus the rate determining step.</em>

Therefore, the rate law for the given mechanism is:

Rate: R = k [A]²

Here, k is the overall rate constant

Also, the overall order of the reaction = 2

Therefore, the given chemical reaction is said to be second order reaction.

3 0

3 years ago

The following questions involve the quantities of some materials you will be using in the calorimetry lab. Keep a copy of your a

Dovator [93]

Answer:

0.075 moles

Explanation:

Molarity = Mass/ Molar Mass*1000/Volume(ml)

Mole = Mass/ Molar mass

Given

Molarity = 1.50 moles/ml

Volume = 50 ml

∴ moles = Molarity*Volume/1000

=1.50 *50 / 1000

=0.075 moles

4 0

3 years ago