14. A child's lungs can hold 2.20 L. How many grams of air do her lungs hold at a pressure of
102 kPa and a body temperature of 37°C? Use a molar mass of 29 g/mol for air, which is about 20% O2 and 80% N2.

Explanation:

Use the gas equation: PV=nRT

P=pressure

V=Volume

R= gas constant of around 8.31 J/K/mol

T=temperature

n= number of moles

To find n, Rearrange:

n=PV/RT

102kPa= 102,000 kilo pascals which standard form is 102 x 10^3

Convert Celsius to kelvin, which you just add 273.15. So:

37+273.15=310.15 K round to a whole number is 310 K

Sub in all numbers to calculate the mol

n= 102 x 10^3 x 2.20 x 10^3/ 8.31 x 310 (cross out 10^3 as this will make a big number)

n=102 x 2.2/8.31 x 310 =0.087 mol

We know 1 g=29 moles

Multiply 29 moles with 0.087 to find the grams

29*0.087=2.523, which to one d.p is 2.5 g

Hence, the child's lung will hold 2.5 g of air.

Hope this helps you  :)

Have a nice day!!

The mass of air is 2.53 grams

Explanation:

Step 1: Data given

Volume of the lungs = 2.20 L

Pressure = 102 kPa = 1.00666 atm

Body temperature = 37.0 °C = 310 K

Molar mass of air = 29 g/mol

Step 2: Calculate number of moles

p*V = n*R*T

⇒with p = the pressure = 1.00666 atm

⇒with V = the volume of the lungs = 2.20 L

⇒with n = the number of moles air = TO BE DETERMINED

⇒with R = the gas constant = 0.08206 L*atm/mol*K

⇒with T = the temperature = 310 K

n = (p*V)/(R*T)

n = (1.00666 * 2.20) / (0.08206* 310)

n = 0.0871 moles

Step 3: Calculate mass of air

Mass air = moles of air * molar mass

Mass air = 0.0871 moles * 29 g/mol

Mass air = 2.53 grams

The mass of air is 2.53 grams

the answer is   c.) 1575 j.

explanation:

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.