Magnesium + oxygen makes Magnesium Oxide.
The big numbers are for balancing the equation.
Answer:
Explanation:
Moles of sodium
=
130
⋅
g
22.99
⋅
g
⋅
m
o
l
−
1
=
5.65
⋅
m
o
l
.
Now you have the stoichiometric equation:
2
N
a
(
s
)
+
2
H
2
O
(
l
)
→
2
N
a
O
H
(
a
q
)
+
H
2
(
g
)
↑
⏐
If there are
5.65
⋅
m
o
l
of metal, clearly
5.65
⋅
m
o
l
2
dihydrogen gas are evolved......, i.e.
2.83
⋅
m
o
l
H
2
. Typically, in a question like this, you would also be asked to calculate the volume the gas occupies under standard conditions, and the
p
H
of the resultant solution (would it be high, low, neutral?).
Answer:
E=1.1
Explanation:
let's consider moles of E is X
3(0.20)+5(0.30)+0.10 =2X
2.2=2X
x=1.1
Answer:
0,61 moles of potassium permanganate equal 3.67 x 10^23
Explanation:
The mole is defined as the amount of compound that contains Avogadro's number of particles (atoms, molecules, ions, electrons, etc.). Avogadro's number has a value of: 6,023 · 10e23 particles.
6,023 · 10e23 particles.---1 mol KMn04
3.67 x 10e23 particles-----x=
x= ( 3.67 x 10xe23 particles1 mol KMn04 )/6,023 · 10e23 particles=0,609 moles
Answer:
B. 39.1 g.
Explanation:
- It is known that every 1.0 mole of any atom contain Avogadros no. of atoms (6.022 x 10²³).
<em>∴ 6.02 x 10²³ atoms are in 1.0 mol of K.</em>
- We need to calculate the mass of 1.0 mol of K using the relation:
<em>∴ </em>mass of K = no. of moles of K x atomic mass of K = (1.0 mol)(39.1 g/mol) = 39.1 g.