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3 years ago

Explain what it means to have a positive percent error value and a negative percent value.

Chemistry

1 answer:

pentagon [3]3 years ago

4 0

Answer:

The error of an experiment is the difference between the experimental and accepted values. If the experimental value is less than the accepted value, the error is negative. If the experimental value is larger than the accepted value, the error is positive.

Explanation:

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A solution of H 2 SO 4 ( aq ) with a molal concentration of 1.66 m has a density of 1.104 g / mL . What is the molar concentrati

uysha [10]

Answer:

1.58 M

Explanation:

$H_2SO_4$ is 1.66 m concentration.

Which means that 1.66 moles of $H_2SO_4$ are present in 1 kg of the solvent, water.

Mass of water = 1 kg = 1000 g

Moles of $H_2SO_4$ = 1.66 moles

Molar mass of $H_2SO_4$ = 98.079 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$1.66\ mole= \frac{Mass}{98.079\ g/mol}$

$Mass_{H_2SO_4}= 162.81114\ g$

Total mass = 1000 g + 162.81114 g = 1162.81114 g

Density = 1.104 g/mL

Volume of the solution = Mass / Density = 1162.81114 / 1.104 mL = 1053.27 mL = 1.05327 L

Considering:-

<u>Molarity = moles/ Volume of solution = 1.66 / 1.05327 M = 1.58 M </u>

4 0

3 years ago

If we accelerate a radioactive isotope of an element in a particle accelerator to a speed close to that of light, what would its

Radda [10]

When the speed of the particle is close to that of light, it's observed mass would be infinitely large.

To answer the question, we need to know what observed mass is.

<h3>What is observed mass in relativity?</h3>

This is the mass the body of an object in relativistic motion appears to have.

So, observed mass, m' = m/√(1 - β²) where

m = rest mass and
β = relative velocity of isotope to light.

Now, since the speed of the particle is close to that of light, β ≅ 1.

So, m' = m/√(1 - β²)

m' = m/√(1 - 1²)

m' = m/√(1 - 1)

m' = m/√0

m' = m/0

m' = ∞

So, when the speed of the particle is close to that of light, it's observed mass would be infinitely large.

Learn more about observed mass here:

brainly.com/question/14553472

8 0

2 years ago

Explain why Michelle Johnston says lionfish are the most sustainable fish you can order on a menu

lilavasa [31]

Answer: Lionfish, which are covered in venomous spines, are such successful invaders because they can tolerate a variety of habitats and they reproduce at alarming rates. They also have a voracious appetite and aren't too picky about what they eat. Also, lionfish are sustainable by catching it's prey.

Explanation: Pls mark me as Brainiest. Your answer is here. If you want to learn more about lionfish, copy and paste this link right here: https://sanctuaries.noaa.gov/news/may15/lionfish-invasion.html

Thank you.

3 0

3 years ago

About how many harvests of bamboo can be collected during the time it takes to fully grow one pine tree?

Tomtit [17]

Answer:

bamboo can grow 910 mm (36 in) within a 24-hour period,at a rate of almost 40 mm (1 1⁄2 in) an hour (a growth around 1 mm every 90 seconds, or 1 inch {2.54 centimeters} every 40 minutes).

Explanation:

6 0

3 years ago

Express the equilibrium constant for the following reaction.P4O10(s) ↔ P4(s) + 5 O2(g)K = [P4][O2]^5/[P4O10]K = [O2]^5K = [P4O10

Alex17521 [72]

Answer : The correct expression for equilibrium constant will be, $K=[O_2]^5$

Explanation :

Equilibrium constant : It is defined as the equilibrium constant. It is defined as the ratio of concentration of products to the concentration of reactants.

The equilibrium expression for the reaction is determined by multiplying the concentrations of products and divided by the concentrations of the reactants and each concentration is raised to the power that is equal to the coefficient in the balanced reaction.

As we know that the concentrations of pure solids are constant that is they do not change. Thus, they are not included in the equilibrium expression.

The given equilibrium reaction is,

$P_4O_{10}(s)\rightleftharpoons P_4(s)+5O_2(g)$

The expression of $K$ will be,

$K=[O_2]^5$

Therefore, the correct expression for equilibrium constant will be, $K=[O_2]^5$

7 0

3 years ago