Answer:
More than 30
Explanation:
There are more than More than 30 STDs
I’m taking a good estimation and gonna say B but I’m torn between that and D
Answer:
Explanation:
Using integrated rate law for first order kinetics as:
Where,
is the concentration at time t
is the initial concentration
Given:
75 % is decomposed which means that 0.75 of is decomposed. So,
= 1 - 0.75 = 0.25
t = 60 min
k = 0.023 min⁻¹
Considering the expression for half life as:-
Where, k is rate constant
So,
Answer is: mass of ammonia is 34 grams.
Chemical reaction: 4NH₃ + 7O₂ → 4NO₂ + 6H₂O.
N(O₂) = 2,1·10²⁴.
n(O₂) = N(O₂) ÷ Na.
n(O₂) = 2,1·10²⁴ ÷ 6·10²³ 1/mol.
n(O₂) = 3,5 mol.
From chemical reaction: n(O₂) : n(NH₃) = 7 : 4.
n(NH₃) = 2 mol.
m(NH₃) = n(NH₃) · M(NH₃).
m(NH₃) = 2 mol · 17 g/mol.
m(NH₃) = 34 g.
Answer:
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The balanced molecular equation for the reaction of aqueous sodium sulfate, and aqueous barium nitrate is :