The answer to this question B (10+10)/(5-3)
Answer:
the sum of the mass numbers and the sum of the atomic numbers balance on either side of an equation
Explanation:
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Answer:
Rock
Explanation:
There is a carbon cycle that scientists have studied that shows how carbon is reused in an ecosystem so carbon is not the answer.
There is a hydrogen cycle that scientists have studied that shows how hydrogen is exchanged between biotic and abiotic sources.
There is no rock cycle
There is a water cycle that has been studied by scientists that shows the movement of water within the earth and the atmosphere
The answer is Rock
Answer:
50
Explanation:
We will need a balanced equation with masses, moles, and molar masses of the compounds involved.
1. Gather all the information in one place with molar masses above the formulas and masses below them.
Mᵣ: 30.01 32.00 46.01
2NO + O₂ ⟶ 2NO₂
Mass/g: 80.00 16.00
2. Calculate the moles of each reactant
3. Calculate the moles of NO₂ we can obtain from each reactant
From NO:
The molar ratio is 2 mol NO₂:2 mol NO
From O₂:
The molar ratio is 2 mol NO₂:1 mol O₂
4. Identify the limiting and excess reactants
The limiting reactant is O₂ because it gives the smaller amount of NO₂.
The excess reactant is NO.
5. Mass of excess reactant
(a) Moles of NO reacted
The molar ratio is 2 mol NO:1 mol O₂
(b) Mass of NO reacted
(c) Mass of NO remaining
Mass remaining = original mass – mass reacted = (80.00 - 30.01) g = 50 g NO