Answer:
C. Period
Explanation:
The elements from this section of the periodic table belongs to the same period.
A period on the periodic table is a horizontal arrangement of elements according to their atomic number.
- A group or family is the vertical organization of elements.
- Valence is the number of outer shell electrons an atom possess.
Hey there!
The acronym STP in chemistry stands for Standard Temperature and Pressure. At STP, the temperature will be 273.15 Kelvin (0°C or 32°F) and one mole of gas will occupy 22.4 liters of volume. Standard pressure is set at 1 atm. STP measurements are often used to solve the ideal gas formula (PV = nRT).
Hope this helped you out! :-)
The answer would be liquid, because it can be measured but not be a shape by itself. Hope that helps! :)
Here is the full question:
Air containing 0.04% carbon dioxide is pumped into a room whose volume is 6000 ft3. The air is pumped in at a rate of 2000 ft3/min, and the circulated air is then pumped out at the same rate. If there is an initial concentration of 0.2% carbon dioxide, determine the subsequent amount in the room at any time.
What is the concentration at 10 minutes? (Round your answer to three decimal places.
Answer:
0.046 %
Explanation:
The rate-in;
= 0.8
The rate-out
=
=
We can say that:
where;
A(0)= 0.2% × 6000
A(0)= 0.002 × 6000
A(0)= 12
Integration of the above linear equation =
so we have:
∴
Since A(0) = 12
Then;
Hence;
∴ the concentration at 10 minutes is ;
= %
= 0.0456667 %
= 0.046% to three decimal places
Answer:
8 moles
Explanation:
When we are asked to convert from grams of a substance into moles, we have to use the substance's molar mass.
Meaning that for this problem, we'll <em>use the molar mass of hydrogen peroxide</em> (H₂O₂), as follows:
There are 8 moles in 272 grams of hydrogen peroxide.