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3 years ago

BRAINLIESTT ASAP! PLEASE HELP ME :) Compare stored mechanical energy and mechanical energy.

1 answer:

6 0

Stored mechanical energy is energy stored and awaiting to be used and mechanical energy is the energy that was stored being used.

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A sample of helium has a volume of 3.49 L at 741 mmHg. What would be the volume if the pressure

Naddika [18.5K]

P1: 741 mmHg

V1: 3.49 L P1 x V1 / P2= (741 mmHg) (3.49 L) / 760 mmHg = 3.40 L

P2: 760 mmHg

V2: ? L

5 0

3 years ago

Looking at a potential energy diagram what is the name given to represent the amount of energy given off during an exothermal re

harkovskaia [24]

Answer:

Released energy

Explanation:

8 0

3 years ago

For the reaction POCl3(g) ⇀↽ POCl(g) + Cl2(g) Kc = 0.30. An initial 0.3 moles of POCl3 are placed in a 3.1 L container with init

olya-2409 [2.1K]

Answer: The final concentration of $POCl_3$ is 0.019767 M

Explanation:

Molarity is calculated by using the equation:

$\text{Molarity}=\frac{\text{Number of moles}}{\text{Volume of the solution}}$

Initial moles of $POCl_3$ = 0.3 moles

Volume of solution = 3.1 L

$\text{Initial concentration of }POCl_3=\frac{0.3}{3.1}=0.097M$

For the given chemical equation:

$POCl_3(g)\rightleftharpoons POCl(g)+Cl_2(g)$

Initial: 0.097

At eqllm: 0.097-x x x

The expression of $K_c$ for above equation follows:

$K_c=\frac{[POCl][Cl_2]}{[POCl_3]}$

We are given:

$K_c=0.30$

Putting values in above expression, we get:

$0.30=\frac{x\times x}{(0.097-x)}\\\\x=0.077233,-0.377$

Neglecting the negative value of 'x' because concentration cannot be negative.

So, final concentration of $POCl_3$ = (0.097 - x) = (0.097 - 0.077233) = 0.019767 M

Hence, the final concentration of $POCl_3$ is 0.019767 M

4 0

3 years ago

What is the normality of a solution that contains 1.89g of h2c2o2 2h2oin 1---ml of solution?

garri49 [273]

First convert mass to number of moles. Molar mass of H2C2O2 • 2H2O = 94 / mol

1.89g / (94 g / mol) = .02 mol H2C2O2 • 2H2O

Then we divide by 0.1 L, or 100 mL, and we get a concentration of 0.2 M.

Since there are two positive ions (2 H+), therefore normality is:

0.4 N

6 0

3 years ago

What is the structural formula for 2-methyl 3-ethylbutane?

ivann1987 [24]

Answer:

Explanation:

2-methyl-3-ethylpentane | C8H18 | ChemSpider.

Boiling Point: 115.3±7.0 °C at 760 mmHg

Molecular Formula: C8H18

Density: 0.7±0.1 g/cm 3

Enthalpy of Vaporization: 32.9±0.0 kJ/mol

4 0

3 years ago