Answer: how many industries and factories are in 'x' country.
Explanation: the main causes of global temperature rising are factories because, harmful gases can be released. And if the number of the factories increase the percentage of the harmful gas that is being released also increases. So to clarify evidence you can ask :- how many factories does country 'x' have?
By the way 'x' means any one country.
Half life of phosphorus-24 = 14.3 days
percent of phosphorus-24 left after 144 hours = ?
144 hours = 144/24 = 6 days
6 days/ 14.3 days = 0.42
(1/2)∧0.42 = 0.747
percent left = 0.747 x 100 = 74.7%
answer:
A
explanation:
it have to be balanced to form water
and water is H2O
Answer:
A. (1/2) N₂(g) + O₂ (g) → NO₂(g)
Explanation:
H°rxn = ∑n*H°f, products - ∑n*H°f, reactants (where n is the number of moles)
H°f is the enthalpy of formation at standard conditions, and it's 0 by the compounds formed by a single element at its atmospheric phase. So, to H°rxn = H°f, products, the number of moles of the product must be 1 and the H°f, reactants must be 0.
Both conditions are only satisfied in letter A.
In letter B, the reactants H and Br are not in the molecule formula, so their H°f is not 0. The mase happens in letter C for O, and in letter E for H. In letter D, 2 moles of the product are being formed.
a. 30 moles of H₂O
b. 2.33 moles of N₂
<h3>Further explanation</h3>
Given
a. 20 moles of NH₃
b. 3.5 moles of O₂
Required
a. moles of H₂O
b. moles of N₂
Solution
Reaction
4NH₃+3O₂⇒2N₂+6H₂O
a. From the equation, mol ratio NH₃ : H₂O = 4 : 6, so mol H₂O :
=6/4 x mol NH₃
= 6/4 x 20 moles
= 30 moles
b. From the equation, mol ratio N₂ : O₂ = 2 : 3, so mol N₂ :
=2/3 x mol O₂
= 2/3 x 3.5 moles
= 2.33 moles