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2 years ago

A car walks 3 m north and then 15 m south. What distance did the cat walk

2 answers:

4 0

18m. It does not matter what direction the cat walked as long as it walked in a certain direction for said amount of distance

nata0808 [166]2 years ago

4 0

18m?
Son dis 2nd grade math

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A sample of neon occupies a volume of 461 mL at 1 atm and 273 K. What will be the volume of the neon when the pressure is reduce

Softa [21]

Answer:

0.501 L

Explanation:

To solve this problem we will use Boyle,s Law. According to this law "The volume of given amount of gas is inversely proportional to applied pressure at constant temperature".

V∝ 1/P

V= K/P

VP=K

Here the K is proportionality constant.

so,

P1V1 = P2V2

P= pressure

V= volume

Given data:

P1= 1 atm

V1= 461 mL

P2= 0.92 atm

V2= ? (L)

To solve this problem we have to convert the mL into L first.

1 L = 1000 mL

461/1000= 0.461 L

Now we will put the values in the equation,

P1V1 = P2V2

V2= P1V1/ P2

V2= 1 atm × 0.461 L / 0.92 atm

V2= 0.501 L

4 0

3 years ago

Match the following associations. Exothermic or endothermic

Alekssandra [29.7K]

Answer:

1) ∆H is positive $\Rightarrow$ Endothermic

2) $E_p>E_r$ $\Rightarrow$ Endothermic

3) Energy is absorbed $\Rightarrow$ Endothermic

4) $E_r>E_p$ $\Rightarrow$ Exothermic

5) ∆H is negtive $\Rightarrow$ Exothermic

Explanation:

∆H is called as enthalpy change

It is also called as Heat of reaction

Energy is required for the bond to break a bond.

Energy is released when a bond is formed.

$H_2+Cl_2>2HCl$

that is

$H-H+Cl-Cl>2H-Cl$

We see in this equation, bonds between hydrogen and chlorine molecules gets broken and on the right side bond is formed in HCl.

If energy of products greater than energy of reactants then the reaction enthalpy change is endothermic .

If energy of products lesser than energy of reactants then the reaction enthalpy change is exothermic .

For example

$\Delta H=E_p-E_r$

$=30KJ-20KJ$

$=+10KJ$

(positive hence endothermic)

$\Delta H=E_p-E_r$

$=10KJ-40KJ$

$=-30KJ$

(negative hence exothermic)

8 0

3 years ago

Calculate the net change in enthalpy for the formation of one mole of acrylic acid from calcium carbide, water and carbon dioxid

Zielflug [23.3K]

Check the attached file for the answer.

5 0

2 years ago

Suppose that the mechanism of hydrolysis of tert- butyl chloride preceded by a different mechanism so that the predicted rate la

ddd [48]

Answer:

B, because that was the answer on quizlet.

Explanation:

5 0

2 years ago

Toluene (C7H8) and nitric acid (HNO3) are used in the production of trinitrotoluene (TNT, C7H5N3O6), an explosive. C7H8 + HNO3 =

olga55 [171]

The mass in grams of nitric acid that is required to react with 454g C7H8 is 932.72 grams

calculation
find the moles of C7H8 used
moles = mass/molar mass

= 454 g/92 = 4.935 moles

balanced reacting equation

C7H8 +3 HNO3 = C7H5N3O6 +3 H20
by use of mole ratio between C7H8 to HNo3 which is 1:3 the moles of HNO3 =4.935 x3 = 14.805 moles

mass of HNo3 = moles x molar mass
= 14.805 x 63 = 932.72 grams

part B

the mass of C7H5N3o6 = 2045.5 grams

calculate the moles of C7H8
= 829 g/92 g/mol = 9.011 moles

by use of mole ratio between C7H8 to C7H5N3O6 which is 1:1 the moles of C7H5N3O6 is also = 9.011 moles

mass of C7H5N3O6 is therefore = moles x molar mass

=9.011 x227 = 2045.5 grams

8 0

3 years ago