Low air pressure cause it was on my test last year
Science can create new forms of energy that dont use coal for example; hydroelectricity, wind power, solar power, steam power, fusion, fission, etc.
Or science can create more efficient ways to use the resources.
Answer:
The number of mole is 2.422 moles
Explanation:
To calculate the number of mole, we have to use the formula n = m /Mm
n - moles
m - mass
Mm - molar mass
Let's calculate the molar mass of the compound SiO2
Si - 28.0855
O - 15.999
Note: there are two atoms of oxygen in the compound
Mm of SiO2= 28.0855+ 2* 15.999
= 60.0835g/mol
Now, we calculate the number of moles
n = 145.54g/ 60.0835g/mol
= 2.422mol
Answer: Option B
Explanation:
Dead space is the volume of sir in the body which is inhaled but it does not takes part in the gaseous exchange this is because it does not contains alveoli.
Not all the air that is inhaled inside the body is used in the process of respiration.
The dead space in the lungs is the region which helps in conducting airways, the air is not perfused to the alveoli.
