Could you please CHECK my Answers for my study guide? Please ASAP!

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 <-------------

question 1 is correct

question 2
the mole is not a unit it is a number as you know 1 mole = 6.022 x10^23
so 1 mole of atoms will always be 6.022 x10^23 what ever atoms you are counting
however 1 mole of uranium would weigh considerably more than 1 mole of carbon or 1 mole of oxygen.

question 3 is correct

question 4 is correct

question 5 is correct