If you have 1 mole of baking soda (NaHCO3), then about how many atoms of oxygen do you have?
(Points : 1)
6.0 × 10^23
1.2 × 10^24
1.8 × 10^24 <------------------------
2.4 × 10^24
2. You have one mole of each of the following atoms: carbon-12, oxygen-16, and uranium-235. Which substance has more atoms?
(Points : 1)
carbon-12
oxygen-18
uranium-235
All have the same number of atoms. <--- this one but I don't get why... Could you explain plz?
3. Which of the following values approximately represents the number of atoms in one mole of gold?
(Points : 1)
2.30 × 10^6
3.26 × 10^26
6.02 × 10^23 <--------- this one.
12.04 × 10^24
4. Each molecule of hydrogen gas (H2) is made of two hydrogen atoms. If you have 6.022 × 10^23 molecules of hydrogen gas, then how many moles of hydrogen atoms do you have?
(Points : 1)
1
2 <---------
6
12
5. How many total atoms are in one mole of ammonia (NH3)?
(Points : 1)
6.0 × 10^23
1.2 × 10^24
1.8 × 10^24
2.4 × 10^24 <-------------
(Points : 1)
6.0 × 10^23
1.2 × 10^24
1.8 × 10^24 <------------------------
2.4 × 10^24
2. You have one mole of each of the following atoms: carbon-12, oxygen-16, and uranium-235. Which substance has more atoms?
(Points : 1)
carbon-12
oxygen-18
uranium-235
All have the same number of atoms. <--- this one but I don't get why... Could you explain plz?
3. Which of the following values approximately represents the number of atoms in one mole of gold?
(Points : 1)
2.30 × 10^6
3.26 × 10^26
6.02 × 10^23 <--------- this one.
12.04 × 10^24
4. Each molecule of hydrogen gas (H2) is made of two hydrogen atoms. If you have 6.022 × 10^23 molecules of hydrogen gas, then how many moles of hydrogen atoms do you have?
(Points : 1)
1
2 <---------
6
12
5. How many total atoms are in one mole of ammonia (NH3)?
(Points : 1)
6.0 × 10^23
1.2 × 10^24
1.8 × 10^24
2.4 × 10^24 <-------------
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1.) You have one mole of NaHCO3 - - which means you'll have 3 moles of Oxygen atoms. Thus, it's just 3 x 6.022E23 = 1.8 x 10^24 - - - so, you're correct.
2.) You are right - they all have the same number of atoms. I like to think of the term "moles" like the term "dozen." If you have a dozen bricks, that weighs a lot more than a dozen feathers. But you'll have the same number of feathers/bricks. One mole of uranium will weigh quite a bit more than a mole of carbon - - but a mole is just the number of atoms present. (6.022 x 10^23 atoms, to be exact.)
3.) Yes, that's just Avogadro's number. One mole of gold has the same number of atoms as one mole of every other element (as discussed in #2).
4.) Yup, you're correct again. This is similar to question one. If you have one mole of H2 - - then you have 2 moles of H.
5.) Correct again. 4 x 6.022E23 = 2.4 x 10^24
2.) You are right - they all have the same number of atoms. I like to think of the term "moles" like the term "dozen." If you have a dozen bricks, that weighs a lot more than a dozen feathers. But you'll have the same number of feathers/bricks. One mole of uranium will weigh quite a bit more than a mole of carbon - - but a mole is just the number of atoms present. (6.022 x 10^23 atoms, to be exact.)
3.) Yes, that's just Avogadro's number. One mole of gold has the same number of atoms as one mole of every other element (as discussed in #2).
4.) Yup, you're correct again. This is similar to question one. If you have one mole of H2 - - then you have 2 moles of H.
5.) Correct again. 4 x 6.022E23 = 2.4 x 10^24
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Hello,
They are all correct!
In number 2, each atom is paired up with its molar mass, meaning the mass one mole of its atoms it would weigh. Since they are all at one mole each, they have the same number of atoms. <<
They are all correct!
In number 2, each atom is paired up with its molar mass, meaning the mass one mole of its atoms it would weigh. Since they are all at one mole each, they have the same number of atoms. <<
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O_O
All I saw was a bunch of numbers.
Math. :|
All I saw was a bunch of numbers.
Math. :|