Answer:
Explanation:
The main difference between these two is that a star has a solid rock and gas surface, while a comet has tail of dust and gas. A star is a giant mass of rock and gas that follows a set eliptical path. Comets on the other hand are made of ice and dust with some gases and usually travel in a straight path. This is why they have a tail of dust and gas which is the ice burning up behind it as it travels at extremely high speeds.
Answer:
357.475
Explanation:
First you need periodic table and you have to look for mass
Fe = 3 x 55.845 = 167.535
P = 2 x 30.97 = 61.94
o = 4 x 2 so 8 oxygen = 8 x 16 = 128
add all and you get 357.475
Answer:
Sr 2+(aq) + SO42-(aq) → SrSO4(s)
Explanation:
<u>Step 1</u>: Write a properly balanced equation with states:
K2SO4(aq) + Srl2(aq) → 2KI(aq) + SrSO4(s)
<u>Step 2</u>: write the full ionic equation with states. Remember to keep molecules intact. Only states (aq) will dissociate, (s) will not dissociate
. This means SrSO4 won't dissociate.
2K+(aq) + SO42-(aq) + Sr 2+(aq) + 2I-(aq) → 2K+(aq) + 2I-(aq) + SrSO4(s)
<u>Step 3</u>: Balanced net ionic equation
Sr 2+(aq) + SO42-(aq) → SrSO4(s)
Answer :
(a) The number of grams in 1 amu is,
(b) The number of atoms in a pound-mole of a substance is,
Explanation :
<u>Part (a) : </u>
As, we know that:
1 gram = amu
Now we have to determine the number of grams in 1 amu.
As, amu = 1 gram
So, 1 amu =
Thus, the number of grams in 1 amu is,
<u>Part (b) :</u>
As we know that the value of gram-mole is same in pound-mole.
Now we have to determine the number of atoms in a pound-mole of a substance.
Number of atoms = Pound-mole × Avogadro's number
As, 1 Pound-mole = 453.6 gram-mol
Avogadro's number =
Number of atoms = 1 pound-mol ×
Number of atoms = 453.6 gram-mol ×
Number of atoms =
Thus, the number of atoms in a pound-mole of a substance is,