Answer:
The final temperature of the solution is 46.93°C
Explanation:
we have to calculate the heat produced.
where,
= enthalpy change = 81.5 kJ/mol
q = heat released = ?
m = mass of CaCl_2 = 15.0 g
Molar mass of CaCl_2 = 110.98 g/mol
Now put all the given values in the above formula, we get:
calculate the final temperature of solution in the calorimeter.
where,
q = heat produced = 11.0 kJ = 11000 J
m = mass of solution = 15.0 + 105 = 120.0 g
c = specific heat capacity of water = 4.18J/g°C
= initial temperature = 25.0°C
= final temperature = ?
Now put all the given values in the above formula, we get:
The final temperature of the solution is 46.93°C
Answer:Calculations must be done first because energy depends on both temperature and mass.
Explanation:
(4) Increase citizen participation in government
Primary: a way for citizens to vote for new government officials, not too influenced by party leaders
Secret Ballot: keeping a voter's votes private from others
Recall: a way for citizens to remove a government official from office
Referendum: a way for citizens to vote for or against something proposed by the legislature
During the Progressive Era, many local governments were lead by corrupt political machines. They would rig elections in their favor as well as threaten those who voted against them. Many would appoint their supporters who weren't usually qualified to government positions as incentive to vote for them (I don't know if you care but that's called the spoils system).
<span>It's not (1) because the whole point of primaries, secret ballots, recalls, and referendums was so political machines were not dominating
</span>It's not (2) because none of this has a lot to do with Native Americans
It's not (3) because the political machines were a <u>local</u> government problem, not federal
It <u><em></em>IS</u> (4) because by getting more people involved in the government, they can elect qualified officials, vote on laws that best benefit the people, and minimize corruption.
1. we used <u>Symbol</u> to represent an element.
2. The chemical formula of a molecule shows the <u>number and kind of atoms contained in the molecule</u>.
3. K (potassium) is the atom among the given choices.
4. CO (carbon - monoxide) is the molecule among given choices.
Mass percent is the amount of solute per amount of solution times 100.
Mass percent = 3.75 mol / L ( 1L / 1230 g ) ( 98.08 g / 1 mol ) 100 = 27.86%
Molality is the amount of solute in moles per kilogram solution.
Molality = 3.75 mol/L ( 1 L / 1230 g ) (1000 g / 1 kg ) = 2.84 mol / kg
Mole fraction is the<span> amount of solute per amount of solution with units of moles.</span>