Answer:
B
Explanation:
Cuz they are supported once discovered and then widely spread then accepted
A chemical is classified as being volatile if it is readily evaporated at room temperature. <span>Volatility is related to a substance's </span>vapor pressure<span>. At a given temperature, a substance with higher vapor pressure vaporizes more readily than a substance with a lower vapor pressure.</span>
Answe
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Explanation:
We use the equation:
Mass = Number of moles * Molecular or atomic mass
Since the number of moles is 1 ("one mole of carbon-12 atoms") and the atomic mass of carbon-12 atoms is 12, hence the mass would be 12 grams. Note that the unit grams (g) is used here, as it is the SI unit for mass measurement.
Number of particles in 1 mole = 6.023 × 1023
Mass of 1 electron = 9.10938 × 10-28 gm
Mass of 1 mole of electrons = 6.023 × 1023 × 9.10938 × 10-28 = 5.486 × 10 -4
Mass of 1 proton = 1.67262 × 10 -24 gm
Mass of 1 mole of protons = 6.023 × 1023 × 1.67262 × 10 -24 gm = 1.007 gm
Mass of 1 neutron = 1.67493 × 10-24 gm
Mass of 1 mole of neutron = 1.67493 × 10-24 × 6.023 × 1023 = 1.008 gm
Answer:
molecular formula = MgSO4.7H2O
Name is Magnesium sulfate heptahydrate
Explanation:
A hydrate of magnesium sulfate has a mass of 13.52 g. This sample is heated until no water remains. The MgSO4 anhydrate has a mass of 6.60 g. Find the formula and name of the hydrate.
given
mass 1 = 13.52 g
mass 2 = 6.60 g
solution
MgSO4 × H2O
first we ge here mass of hydrate part that is here
mass of hydrate part = (13.52 g - 6.60 g)
mass of hydrate part = 6.92 g
and
now we get here percentage of hydrate that is
percentage of hydrate = (6.92 / 13.52) x 100
percentage of hydrate = 51.18 %
so molar mass will be
molar mass of hydrate MgSO4 = 120.366 g/mol = 49.82 %
and for 100% = 241.6 g
so
mass of H2O = 121.23 g
and
moles of H2O = 7
so we can say that molecular formula will be MgSO4.7H2O
and name is Magnesium sulfate heptahydrate