1 mole ------------ 6.02 x10²³ molecules
? mole ----------- 1.505 x10²³ molecules
1.505x10²³ / 6.02x10²³ => 0.25 moles
hope this helps!
Answer:
A
Explanation:
I believe the answer is A. An object is every color except the color we see, or the color that bounces off of said object. Therefore if a carpet is yellow, the carpet is every color but yellow. Yellow is the color that it rejects, bounces off of it, and the one we see.
Answer:
Mass of NaOH required= 60 g
Explanation:
Given data:
Mass of NaHCO₃ = 126 g
Mass of NaOH required = ?
Solution:
Chemical equation:
NaOH + CO₂ → NaHCO₃
Number of moles of NaHCO₃:
Number of moles = mass/ molar mass
Number of moles = 126 g/ 84 g/mol
Number of moles = 1.5 mol
Now we will compare the moles of NaHCO₃ and NaOH.
NaHCO₃ : NaOH
1 : 1
1.5 : 1.5
Mass of sodium hydroxide:
Mass = number of moles × molar mass
Mass = 1.5 mol × 40 g/mol
Mass = 60 g
H2 + O -> H2O
I'm pretty sure that's the answer, just tell me if I'm wrong.
