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3 years ago

Calculate the number of molecules in 100. g of O2 *

Chemistry

1 answer:

Sindrei [870]3 years ago

6 0

I am pretty sure the answer is 6.25 molecules
See picture for explanation

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The mass of an unidentified metal sphere is 133 grams. Students determine the

Rainbow [258]

Given the data from the question, the identity of the unknown metal having a of mass 133 g is Cobalt

<h3>What is density? </h3>

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

<h3>How to determine the density </h3>

Mass = 133 g
Volume of water = 25 mL
Volume of water + metal = 40 mL
Vol of metal = 40 – 25 = 15 mL

Density =?

Density = mass / volume

Density = 133 / 15

Density = 8.86 g/mL

Comparing the density of the unknown metal (i.e 8.86 g/mL) with those given in the chart in the question above, we can conclude that the unknown metal is Cobalt

Learn more about density:

brainly.com/question/952755

4 0

2 years ago

You are planning an investigation that explores properties of matter.

Elena-2011 [213]

Answer:

Placing a powder into a beaker that contains liquid, resulting the beaker to get hotter.

Explanation:

Physical property is something that you can observe that does not affect the mixture/solution/substance, and that includes temperature

7 0

2 years ago

If a car is traveling 100 km/h and comes to a stop in 3 minutes,what is acceleration of a passenger who is using vehicle restrai

Rama09 [41]

We are given –

Final velocity of car is, v= 0
Initial velocity of car is, u= 100 km/hr
Time taken, t is = 3 minutes or 180 sec

Here–

$\qquad$ $\pink{\bf \longrightarrow Initial\: velocity = 100 \:km/hr}$

$\qquad$ $\sf \longrightarrow Initial\: velocity = \dfrac{ 100 \times 1000}{3600} \:m/s$

$\qquad$ $\pink{ \bf \longrightarrow Initial\: velocity = 27.78\: m/s}$

Now –

$\qquad$ ____________________________

$\qquad$ $\purple{\bf \longrightarrow Acceleration = \dfrac{Final\: Velocity -Initial \:Velocity }{Time}}$

$\qquad$ $\purple{\bf \longrightarrow Acceleration = \dfrac{v -u}{t}}$

$\qquad$ $\sf \longrightarrow Acceleration = \dfrac{(0- 27.78)}{1800}$

$\qquad$ $\sf \longrightarrow Acceleration =\cancel{ \dfrac{- 27.78}{1800}}$

$\qquad$ $\purple{\bf \longrightarrow Acceleration = -0.15 \: m/s^2}$

$\qquad$ _______________________________

6 0

2 years ago

The stronger the wind, the larger the particles it erodes.

Fittoniya [83]

I believe the statement above is true. The stronger the wind, the larger the particles it erodes<span>. The stronger the wind, the larger the particles that are carried away.

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7 0

3 years ago

A neutral atom has the following electron configuration: What is the chemical symbol for the atom? How many electrons does the a

tiny-mole [99]

Answer:

pls the image didn't come

Explanation:

ols the. atom's image didn't appear

3 0

3 years ago