NaOH
Na=23
O=16
H=1
SO,NaOH=23+16+1
NaOH=40g/mol
42% of 40=42/100x40
oxygen is the compound
density=mass/volume
1.30=mass/6
mass=7.8g
The role energy would have played in forming the black sand on the beach
will be through the erosion and movement of the particles.
Black sand from the beach are formed as a result of the erosion of volcanic
material , dark-colored rocks and minerals. Erosion helps to carry these
particles to the beach thereby making the color of the sand to become dark.
The wave energy present at the beach erodes and moves the materials to
different parts of the beach.
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Answer:
The air around you
Explanation:
Matter is defined as anything that has mass and occupy space. Matter may sometimes not be seen with naked eyes.
The decision we had to take on the answer is based on the fact that air has mass and does occupy space.
Air can be trapped in a container and its mass measured hence air is an example of matter.
Mg(s)+2HCl(aq)→MgCl2(aq)+H2(g)
(since the molar mass of Mg is not given, assuming that it's mola mass is 24gmol¯1)
1st find the moles of Mg using the equation n=m/M where
n - moles
m - mass
M - molar mass
Therefore :
n = 0.39375mol
n = 0.39mol
Then using the equation n=V/Vm where;
n = mol
V = volume
Vm = molar volume
Find the volume.
n = V/Vm
(n =0.39mol , Vm = 22.4dm³mol¯¹)
V = 0.39mol×22.4dm³mol¯¹
V = 8.736dm³