Which of the following samples has the greatest mass? 1.4 mol Na 1.02 × 1024 atoms Na 23 g Na 6.02 × 1023 atoms Na

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Which of the following samples has the greatest mass? 1.4 mol Na 1.02 × 1024 atoms Na 23 g Na 6.02 × 1023 atoms Na

Chemistry
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:)
Can you convert all of these to grams?

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Other answers:

23 g Na im giving u free medals sorry
lol i figure out the answer after i post lol
Haha, thanks, but I don't get 23 g to be the answer.
how so?
Because I get one of the other options to be more mass when converted to grams.
ooh
Do you know how to convert from moles to mass?
not really
Ok, let me show you. We use the molar mass. Do you know what the molar mass of Na is?
22.9898
Right. And that number is the number of grams in 1 mole of Na
yes
We need to do a conversion that cancels out the unit of mol and goes to g |dw:1434382435002:dw|
Then we fill in the numbers|dw:1434382521787:dw|
And multiply the fractions.|dw:1434382560516:dw|
Make sense?
yes
Cool, so is that more than 23?
haha yes..
lol
:-) So that is the highest so far. But we need to check the other two options too.
ok c:
The amounts given in atoms, we have to do two steps. First converting to moles, then to grams.
Do you know how many atoms are in 1 mol?
6.02 x 10^23
Great! So can you use a similar conversion to convert to moles?
avogadro's number
yes
Cool. how many moles do you get for B?
idk
Let me set it up for you.|dw:1434383025321:dw|
Where do you think the numbers go?
1 mole
Right. :-) And?
6.02 x 10^23 atoms
Yep, great! So, can you find the number of moles now?
yes
:D
What do you get?
39
Did you go straight to grams? :-)
yes
Great!
So, can you find the grams for D?
23g Na
:-) So, which one has the most mass?
B :)
right
Yep!
An atom is determined to contain 17 protons, 18 electrons, and 18 neutrons. What are the mass number and charge of this atom or ion? mass number: 36, charge: -1 mass number: 35, charge: +1 mass number: 35, charge: -1 mass number: 36, charge: neutral
this one is confusing me
Ok, what does the mass number mean?
the total number of protons and neutrons
Good, so what do you get for the mass number?
35 so that eliminates a and d
Good. And do you have any ideas on how to find the charge?
no
Protons have a +1 charge and electrons have -1 charge.
So, since we have one more electrons, that gives us a -1 overall charge.
ooh ok thanks
You're welcome :-)
What types of questions can be answered through science and what questions are beyond the boundaries of science? Be specific and give examples to support your answer.
What do you think?
i just tagged u

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