Chemistry, 17.05.2021 03:20 hasshh

Convert particles to moles: 8.3 x 10^20 atoms Cu

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Answer from: jennifer2129

$\boxed {\boxed {\sf 0.0014 \ mol \ Cu}}$

Explanation:

We are asked to convert particles to moles.

1. Avogadro's Number

1 mole of any substance contains the same number of particles (atoms, molecules, formula units). This is Avogadro's Number or 6.022*10²³.

In this problem, the particles are atoms of copper. So, 1 mole of copper contains 6.022*10²³ atoms of copper

2. Convert Atoms to Moles

Use Avogadro's Number to make a ratio.

$\frac{ 1 \ mol \ Cu}{ 6.022*10^{23} \ atoms \ Cu}$

We are trying to convert 8.3*10²⁰ atoms of copper to moles, so we multiply that value by the ratio.

$8.3*10^{20} \ atoms \ Cu*\frac{ 1 \ mol \ Cu}{ 6.022*10^{23} \ atoms \ Cu}$

The units of "atoms Cu" will cancel.

$8.3*10^{20}\frac{ 1 \ mol \ Cu}{ 6.022*10^{23} }$

Condense the expression into 1 fraction.

$\frac{8.3 *10^{20}}{ 6.022*10^{23} } \ mol \ Cu$

$0.001378279641 \ mol \ Cu$

3. Round

The original measurement of atoms has 2 significant figures, so our answer must have the same. For the number we calculated that is the ten-thousandths place.

0.001378279641

The 7 in the hundredth thousandth place tells us to round the 3 up to a 4.

$0.0014 \ mol \ Cu$

8.3*10²⁰ atoms of copper are equal to 0.0014 moles of copper.

Answer from: Quest

that's just how they are

explanation:

you can't control another persons decisions, all you can do is ask that they respect yours. relationships are hard because you have to put the effort into making sure that another person feels seen, heard, and loved. as time goes on, it gets easier, you learn how to do these things without thinking. loving them becomes as easy as breathing, but every relationship will have fights, and sometimes it'll feel like you're drowning, but as long as you can talk it out and compromise, because that's truly what loving another person is, is compromise, then you'll be okay. movies and tv shows have glamorized and romanticized (pardon the pun) what a relationship would be like. real relationships aren't perfectly timed kisses in the rain, zero fights until one big one ends everything, 6 month anniversaries. real relationships are sleepy confused kisses when one person has to leave for work earlier than the other, real relationships are having small disagreements, real relationships are messy and confusing, real relationships is knowing that even if you're relationship may not last forever and this may not be the person you're going to spend the rest of your life with, that you love them, and you would do anything to see them happy. so yes, relationships are difficult, but so are many other things, relationships can be amazing but also stressful, and not just romantic i'm also talking about platonic relationships (although the primary example here was romantic) sometimes is best to leave friendships behind, so remember, always do whats going to you be happy in the long run.

Answer from: Quest

explanation:

0.07 g/cm³

1.37 g/cm³

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Convert particles to moles: 8.3 x 10^20 atoms Cu...