Answer:
D. 2:5
Explanation:
It has 5 valency electrons
Answer:
No of neutrons and protons decides mass of the atom. Electrons having negligible
mass are ignored.
Mass of atom
Mass of atom= sum of no of protons(Z) and neutons(N)
=Z+N
For eg:
In hydrogen atom,
Mass of H= Z+N
=1+0
=1 AMU
Answer:
4.50 g of H₂O
Explanation:
The Balance chemical equation is
2 H₂ + O₂ = 2 H₂O
Step 1: Calculate Limiting Reagent
Moles of H₂
Mole = 2 g / 2.02 g/mol = 0.99212 mol
Moles of O₂
Mole = 4 g / 32.00 g/mol = 0.125 mol
Mole ratio of H₂ : O₂ is 2 : 1. Hence, 0.99212 mol of H₂ will need 0.49606 mol of O₂. This means O₂ is limiting reagent.
Step 2: Calculate Moles of H₂O
0.125 mol of O₂ will produce 0.250 mol of H₂O because the mole ratio of O₂ : H₂O is 1 : 2.
Step 3: Calculate mass of H₂O
Mass = 0.250 mol × 18.02 g/mol = 4.50 g of H₂O
E. A direct measure of internal kinetic energy
Answer:
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