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
Answer:pressure A<B
RMS speed A<B
Average kinetic energy A<B
Explanation:
All three listed properties of the gases depend on molecular weight. The lighter the gas, the more it's pressure, root mean square speed and average kinetic energy. If a gas has a high relative molecular weight, it have a high velocity as predicted by Graham's law. Hence the answer.
Number of moles of solute in 16.55 mL of 0.1475 M M2Cr3O7 is 0.00244 moles.
<u>Explanation:</u>
The properties and behavior of many solutions depend not only on the nature of the solute and solvent but also on the concentration of the solute in the solution. Molarity (M) is the concentration of a solution expressed as the number of moles of solute per liter of solution:
,
Here , .
⇒
⇒
⇒
⇒
Therefore, Number of moles of solute in 16.55 mL of 0.1475 M M2Cr3O7 is 0.00244 moles.
Answer:
Ca.
Sb.
Explanation:
a. When comparing the two elements Ca and As , the more metallic element is:__________ based on periodic trends alone.
The correct option is Ca. Ca belongs to group 2 which is more easily give off it's electrons, compared to As which is a group 5 member.
c. When comparing the two elements Sb and Pb , the more metallic element is:___________ based on periodic trends alone.
The correct option here is Pb. Thhs is because ionization energy decreases down the group. Pb has a lower ionization enthalpy than Sb