Answer:
period 6
Explanation:
If the lanthanides were inserted into the periodic table, they would go into periodic 6.
Their atomic number is between 57 - 71 from element lanthanum to lutetium.
- The elements in this period are 15 in number.
- They are also know as elements in the f-block.
The elements that makes up the series are:
Lanthanum
Cerium
Praseodymium
Neodymium
Promethium
Samarium
Europium
Gadolinium
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
Lutetium
no of moles in 4 grams of H2=4/2=2
2H2+O2............2H2O
the reaction shows that 2 moles of H2 react with 1 mole of O2 to produced 2 moles H2O
now no of moles in 36grams of H2O=36/18=2
therefore he needed 1 mole of O2 to produce 36 grams of H2O and 1 mole of oxygen is equal to 32 grams of O2
Answer:
1.26 x 10⁸pm³ and 1.26 x 10⁻²²cm³
Explanation: Calculating for a body centered cubic lattice, the formula is
3d²= 16r²
where d = edge length of unit cell
r=radius of atom
3d²= 16 x (217)²
3d²=753424
d²=251141.3
d= 501.1pm
volume of unit cell= d³= (501.1)³= 1.26 x 10⁸pm³
converting to cm³= 1.26 x 10⁸(10⁻¹²m)³
=1.26 x 10⁸(10⁻¹⁰cm)³ = 1.26 x 10⁻²²cm³
The answer is -0.22 for the total impact of velocity 1.1 seconds -5.0=-
Mole ratio:
<span>H2SO4 + Ca(OH)2 = CaSO4 + 2 H2O</span>
1 mole H2SO4 ----------- 1 mole Ca(OH)2
? moles H2SO4 --------- 0.10 moles Ca(OH)2
0.10 x 1 / 1
= 0.10 moles of H2SO4
hope this helps!