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3 years ago

What does the law of conservation of mass state?

Chemistry

2 answers:

katrin [286]3 years ago

8 0

Answer:

matter cannot be created nor destroyed

Explanation:

natulia [17]3 years ago

7 0

Answer:

Mass cannot be created nor destroyed in a chemical reaction

Explanation:

The law of conservation of mass was stated by Antoine lavoisier in 18th century which states that for a isolated system the mass can neither be created nor be destroyed in a chemical reaction. It means that the total mass of the reactants is equal to the total mass of the product formed i.e there is no change in the mass of the reactants even after the reaction which is stated by the law of the conservation of the mass.

The mass of the elements are not created or destroyed but their form is changed to another form of atoms or molecules with conserved mass.

For a balanced chemical equation of the formation of the water, 4 grams of hydrogen combines with 32 grams of the oxygen to give 36 grams of the water where the sum of the mass of the reactant is equals to the mass of the product.

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How do I balance a chemical equation?

bogdanovich [222]

Answer:

Concept: Chemical Analysis

Start by taking inventory of the elements that you have
Make a list, one for the right side and another for the left side
Then add coefficients to the elements to the right or left side to balance out the equation

8 0

3 years ago

The total surface area for the Asia consisting of forest, cultivated land, grass land, and desert is approximately 4.46 x 107 km

tester [92]

Explanation:

We calculate the amount of carbon fixed as follows.

$455 \times 10^{3} kg/km^{2} \times 4.46 \times 10^{7} km^{2}$

= $2029.3 \times 10^{10}$ kg

$\Delta H_{f}_{C_{6}H_{12}O_{6}}$ = -1273.1 kJ/mol

$\Delta H_{f}_{CO_{2}}$ = -393.5 kJ/mol

$\Delta H_{f}_{H_{2}O}$ = -285.8 kJ/mol

Hence, total $\Delta H$ reaction will be as follows.

$\Delta H_{rxn} = (\Delta H_{f}_{C_{6}H_{12}O_{6}}) - 6(\Delta H_{f}_{CO_{2}}) - 6(\Delta H_{f}_{H_{2}O})$

= $-1273.1 kJ/mol - (6 \times 393.5 kJ/mol) - (6 \times 285.8 kJ/mol)$

= 2802.7 kJ/mol

Therefore, calculate the number of moles of fixed carbon as follows.

$n_{c, fixed} = \frac{m_{c, fixed}}{\text{Molar mass of C in kg/mol}}$

= $\frac{4.55 \times 10^{5}kg km^{-2} year^{-1}}{12.01 \times 10^{-3} kg/mol}$

= $3.786 \times 10^{7} mol km^{-2} year^{-1}$

Thus, we can conclude that the annual enthalpy change resulting from the photosynthetic carbon fixation over the land surface is $3.786 \times 10^{7} mol km^{-2} year^{-1}$ .

7 0

3 years ago

Calculate the number of moles of C in the hydrocarbon.

pochemuha

Answer:

Ummmmmmm

Explanation:

This might help c3h7

6 0

3 years ago

Calculate the molarity of a solution containing 2.66 moles of KOH in 750 mL of solution?

ASHA 777 [7]

Molarity = moles of solute/volume of solution in liters.

There are 2.66 moles of KOH, the solute, and the volume of the solution is 0.750 L.

The molarity of this solution would thus be (2.66 moles KOH)/(0.750 L) = 3.55 M KOH.

6 0

3 years ago

Aspirin, like many pharmaceutical drugs, can access the cell because it is a weak acid. This occurs because Choose one: A. it is

sleet_krkn [62]

Answer:

Correct answer is (D). as a weak acid it can cross the membrane when in its uncharged form.

Explanation:

Aspirin (acetylsalicylic acid, ASA) is an analgesic and anti-inflammatory agent use in the treatment of gentle to moderate pain, inflammation and fever. It is absorb in the stomach and intestine in an unchanged form.

6 0

4 years ago