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3 years ago

What is thermal energy, and how can thermal energy be measured?

Chemistry

1 answer:

Dovator [93]3 years ago

4 0

Answer:

hope this helps :)

Explanation:

The thermal energy of an object is the energy contained in the motion and vibration of its molecules. Thermal energy is measured through temperature

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etermine the molar concentration of magnesium ions in a solution formed by mixing 100.0 mL of 0.100 M MgCl, solution with 100.0

marysya [2.9K]

Answer:

Molar concentration of magnesium ions in the final solution is 0.2 M.

Explanation:

$c=\frac{n}{V}$

c = Concentration of the solution

n = moles of the compound

V = volume of the solution in L

1) Molarity of $MgCl_2$ solution = 0.100 M

Volume of $MgCl_2$ solution = 100.0 mL = 0.1 L

Moles of $MgCl_2$ in 100 mL solution= n

$0.100 M=\frac{n}{0.1L}$

$n=0.01 mol$

$MgCl_2(aq)\rightarrow Mg^{2+}(aq)+2Cl^-(aq)$

1 mole of magnesium chloride gives 1 mol of magnesium ions and 2 moles of chloride ions.

Then 0.01 moles of magnesium chloride will give:

$x=\frac{1}{1}\times 0.01 mol=0.01 mol$ magnesium ions.

2) Molarity of $Mg_3(PO_4)_2$ solution = 0.100 M

Volume of $Mg_3(PO_4)_2$ solution = 100.0 mL = 0.1 L

Moles of $Mg_3(PO_4)_2$ in 100 mL solution= n'

$0.100 M=\frac{n'}{0.1L}$

$n'=0.01 mol$

$Mg_3(PO_4)_2(aq)\rightarrow 3Mg^{2+}(aq)+2PO_{4}^-(aq)$

1 mole of magnesium phosphate gives 3 mol of magnesium ions and 2 moles of phosphate ions.

Then 0.01 moles of magnesium phosphate will give:

$y=\frac{3}{1}\times 0.01 mol=0.03 mol$ magnesium ions.

After mixing both solutions:

Moles of magnesium ions = x + y = 0.01 mol + 0.03 mol = 0.04 mol

Total volume after mixing = 0.1 L + 0.1 L = 0.2 L

Molar concentration of magnesium ions in the final solution: $[Mg^{2+}]$

$[Mg^{2+}]=\frac{0.04 mol}{0.2 L}=0.2 mol/L$

4 0

4 years ago

Assume that 300 J of heat is added to 3.00g of water originally at 23°C. what would be the final temperature of the water? The

Iteru [2.4K]

Answer:

47C

Explanation:

Recall the equation for specific heat:

q = mcΔT

300 = 3 x 4.184 x (T - 23)

T = 47

3 0

3 years ago

True or False <br> the way energy flows through an ecosystem can be shown through a food web

spayn [35]

True energy passes from animal to animal or plant to plant

3 0

4 years ago

Read 2 more answers

An experimenter found that for the hydrolysis of lactose, ΔH° = +0.44 kJ mol–1 and ΔS° = +0.031 kJ mol–1 K–1. ΔG°for this reacti

Ksivusya [100]

Answer:

ΔG° = -8.8 kJ/mol

Explanation:

The standard Gibbs free energy of reaction (ΔG°) can be calculated using the following expression.

ΔG° = ΔH° - T.ΔS°

where,

ΔH°: standard enthalpy of reaction

T: absolute temperature

ΔS°: standard entropy of reaction

At 298 K (the temperature that is usually used), ΔG° for the hydrolysis of lactose is:

ΔG° = ΔH° - T.ΔS°

ΔG° = 0.44 kJ/mol - 298 K × 0.031 kJ/mol.K

ΔG° = -8.8 kJ/mol

7 0

3 years ago

Which of the following patients should be admitted as an inpatient at a

aliina [53]

C definitely is the answer

6 0

3 years ago