Which of the following was not a big ideal of chemistry

Convert the length of the cube from inches to centimeter since the density is given in g/cm³.
Determine the mass of the cube using the given density.
Convert the mass of the cube to number of atoms using Avogadro's number.

<u>STEP 1. </u>Converting inches to cm

$length \ in \ cm \ = 2.84 \ in \times (\frac{2.54 \ cm}{1 \ in})\\\boxed {length \ in \ cm \ = 7.2136 \ cm}$

<u>STEP 2:</u> Determining mass of cube from the density

$density = \frac{mass}{volume}\\mass = density \times \ volume\\\\mass \ = 4.50 \frac{g}{cm^3} \times (7.2136 \ cm)^3\\\boxed {mass \ = 1689.15 \ g}$

<u>STEP 3:</u> Converting mass of titanium cube to number of atoms

$no. \ of \ Ti \ atoms = 1689.15 \ g \ Ti \times (\frac{1 \ mol \ Ti}{47.867 \ g})(\frac{6.022 \times 10^{23} \ Ti \ atoms}{1 \ mol \ Ti}) \\\\\boxed {no. \ of \ Ti \ atoms = 2.125 \times 10^{25} \ atoms}$

Since the given values have 3 significant figures, the final answer must be:

$\boxed {\boxed {no. \ of \ atoms \ = 2.12 \times 10^{25} \ Ti \ atoms}}$

<h3>Learn More</h3>

Mole Conversions brainly.com/question/12980009
Stoichiometry brainly.com/question/10513747
Dimensional Analysis brainly.com/question/1594497

Keywords: Avogadro's number

6 0

3 years ago

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Ethan is observing chemical and physical properties of a substance. He heats a substance and observes that the substance turns f

densk [106]

Explanation:

A chemical reaction is defined as the reaction which leads to change in chemical composition of the reactants due to which there occurs formation of a new compound.

For example, when Ethan heats a substance and observes that the substance turns from a brown solid to a black powder then it means heating has lead to a chemical change in the brown solid because of which it has turned into a black powder.

Whereas if there occurs no change in chemical composition of the reactants then we can say that a physical change has occurred.

For example, change in shape, size, mass etc of a substance are all physical changes.

Hence, we can conclude that Ethan best defend his conclusion as a chemical change.

3 0

3 years ago