Balancing of chemical equation is essential because of the law of conservation of mass, which states that the mass of a system can not be created or removed.
The second equation is balanced
This is because the number of elements of each atom in the product side equal the number of elements of each atom on the reactant side.
The first equation is not balanced
![H_2SO_4 _(_a_q) + 2Al_(_s_) ==> Al(SO_4)_3_(_a_q_) + H_2_(_g_)](https://tex.z-dn.net/?f=H_2SO_4%20_%28_a_q%29%20%2B%202Al_%28_s_%29%20%3D%3D%3E%20Al%28SO_4%29_3_%28_a_q_%29%20%2B%20H_2_%28_g_%29)
This is because there is 1 molecule of
on reactant side as compared to 3 molecules of ![SO_4^{-2}](https://tex.z-dn.net/?f=SO_4%5E%7B-2%7D)
To balance the equation we add a coefficient of 3 on sulphuric acid (
) and a coefficient of 3 on hydrogen (
)
![3H_2SO_4_(_a_q_) + 2Al_(_s_) ==> Al(SO_4)_3_(_a_q_) + 3H_2_(_g_)](https://tex.z-dn.net/?f=3H_2SO_4_%28_a_q_%29%20%2B%202Al_%28_s_%29%20%3D%3D%3E%20Al%28SO_4%29_3_%28_a_q_%29%20%2B%203H_2_%28_g_%29)
Answer:
3.02× 10²⁴ atoms
Explanation:
Given data:
Number of nitrogen atoms = ?
Number of moles of N₂O = 2.51 mol
Solution:
1 mole contain 2 mole of nitrogen atoms.
2.51 × 2 = 5.02 mol
According to Avogadro number,
1 mole = 6.022 × 10²³ atoms
5.02 mol × 6.022 × 10²³ atoms / 1 mol
30.2 × 10²³ atoms
3.02× 10²⁴ atoms
Answer
The specific heat of the glass = 0.7366 J/g°C
Explanation
Given:
Mass of the glass sample, m = 9.3 g
Quantity of heat given off, Q = 87 J
Change in temperature, ΔT = 12.7 °C
What to find:
The specific heat, c of the glass.
Step-by-step solution:
The specific heat, c of the glass can be calculated using the given formula below.
![\begin{gathered} Q=mc\Delta T \\ \\ \Rightarrow c=\frac{Q}{m\Delta T} \end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%20Q%3Dmc%5CDelta%20T%20%5C%5C%20%20%5C%5C%20%5CRightarrow%20c%3D%5Cfrac%7BQ%7D%7Bm%5CDelta%20T%7D%20%5Cend%7Bgathered%7D)
Putting the values of the given parameters into the formula, we have;
![c=\frac{87J}{9.3g\times12.7°C}=\frac{87\text{ }J}{118.11\text{ }g°C}=0.7366\text{ }J\text{/}g°C](https://tex.z-dn.net/?f=c%3D%5Cfrac%7B87J%7D%7B9.3g%5Ctimes12.7%C2%B0C%7D%3D%5Cfrac%7B87%5Ctext%7B%20%7DJ%7D%7B118.11%5Ctext%7B%20%7Dg%C2%B0C%7D%3D0.7366%5Ctext%7B%20%7DJ%5Ctext%7B%2F%7Dg%C2%B0C)
Therefore, the specific heat of the glass is 0.7366 J/g°C
Answer:
Molarity = 0.24 mol/L
Explanation:
Given data:
Mass of NaNO3 = 25.4 g
Volume of solution = 1250 mL
Molarity = ?
Solution:
Molarity of solution is equal to the number of moles of solute divided by volume of solution in litter.
Formula:
Molarity = number of moles / volume in L
First of all we will convert the volume in litter.
1 L = 1000 mL
1250 / 1000 = 1.25 L
Now we calculate the moles of NaNO3 in present in 25.4 g.
Number of moles = mass / molar mass
Molar mass of NaNO3 = (23 + 14+ 16×3) = 85 g/mol
Number of moles = 25.4 g / 85 g/mol
Number of moles = 0.299 mol
Now we will calculate the molarity of solution
Molarity = number of moles / volume in L
Molarity = 0.299 mol / 1.25 L
Molarity = 0.24 mol/L
<span>According to Georgia Perimeter College, </span>tap water<span> is not </span>heterogeneous.Heterogeneous mixtures<span> have at least two substances, and viewers can see what is in it. </span>Tap water<span> is </span>homogeneous<span>, as </span>homogeneous mixtures<span> have at least two substances in them, but viewers cannot see them.</span>