3. A volume of 546 mL of hydrogen is collected over water at 30 degrees * C when the atmospheric pressure is 100.45 kPa. How many moles of hydrogen are present ?

Number of moles of hydrogen are 0.022 mol.

Explanation:

Given data:

Volume of hydrogen = 546 mL

Temperature = 30°C

Pressure = 100.45 kpa

Number of moles of hydrogen = ?

Solution:

According to ideal gas equation,

PV = nRT

P = pressure

V = volume

n = number of moles

R = ideal gas constant

T = temperature

First of all we will convert the units,

Temperature = 30 + 273 = 303 K

Pressure = 100.45 /101 = 0.99 atm

Volume of hydrogen = 546 mL× 1L /1000 mL =0.546 L

Now we will put the values in formula,

PV = nRT

n = PV/RT

n = 0.99 atm × 0.546 L /0.0821 atm.L/mol.K × 303 K

n = 0.541 atm. L / 24.876 atm.L / mol

n = 0.022 mol

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.