Redox reaction is the chemical reaction in which both oxidation (loss of electrons) and reduction (gain of electrons) takes place or transfer of electrons between two species occurs.
The given chemical equation is :
Here, in reactant side, the oxidation state of zinc is zero (0), after reacting with hydrogen chloride, the oxidation sate of zinc becomes two (+2). In this reaction, electrons are transferred from zinc atoms to the hydrogen atoms. Thus, zinc is oxidized by losing electrons.
Hence, oxidation state of zinc increases due to loses electrons i.e. Option (A) is correct.
Answer:
Explanation:
To convert from moles to grams, the molar mass must be used.
1. Find Molar Mass
The compound is sodium sulfide: Na₂S
First, find the molar masses of the individual elements in the compound: sodium (Na) and sulfur (S).
- Na: 22.9897693 g/mol
- S: 32.07 g/mol
There are 2 atoms of sodium, denoted by the subscript after Na. Multiply the molar mass of sodium by 2 and add sulfur's molar mass.
- Na₂S: 2(22.9897693 g/mol)+(32.07 g/mol)=78.0495386 g/mol
This number tells us the grams of sodium sulfide in 1 mole.
2. Calculate Grams
Use the number as a ratio.
Multiply by the given number of moles, 3.46.
The moles of sodium sulfide will cancel.
3. Round
The original measurement of grams, 3.46, has 3 significant figures. We must round our answer to 3 sig figs.
For the answer we calculated, that is the ones place.
The 0 in the tenth place tells us to leave the 0 in the ones place.
There are about <u>270 grams of sodium sulfide</u> in 3.46 moles.
The answer is (2) 12mL. The reaction equation is NaOH + HCl = NaCl + H2O. So the mol number of NaOH is equal to HCl. The concentration of NaOH is twice of HCl so the volume of HCl is twice of NaOH.
Answer:
The answer to your question is 22.5 moles of H₂SO₄
Explanation:
Data
moles of H₂SO₄ = ?
moles of Al = 15
Balanced chemical reaction
2Al + 3H₂SO₄ ⇒ Al₂(SO₄)₃ + 3H₂
To solve this problem use proportions and cross multiplication. Use the coefficients of the balanced chemical reaction.
2 moles of Al ------------------- 3 moles of H₂SO₄
15 moles of Al ------------------ x
x = (15 x 3) / 2
x = 45/2
x = 22.5 moles of H₂SO₄
-Conclusion
22.5 moles of H₂SO₄ react completely with 15 moles of Al.
The element that has the smallest atomic radius is TITANIUM.
In the periodic table, the value of atomic radii of elements varies across the period and down the group. Generally, the atomic radii decreases across the period and increases down the group. Looking at the element given in the question, you will notice that they all belong to one period and the last on that period is titanium, thus, it has the smallest atomic radii.