The number of moles contained in each of the question are a) 3.935 and b) 0.001165 mol.
<h3>What are moles?</h3>
Moles are a quantity or amount of a substance. Denoted by n.
To calculate moles, mass is divided by the molar mass
n = m/M
mass is divided by the molar mass
a) 230 grams of NaCl
n = m/M
molar mass of NaCl is 58.44 g/mol
n = 230 / 58.44 = 3.935 mol
b) 0.210 g of aspirin
n = m/M
molar mass of aspirin is 180.158 g/mol
n = 0.210 / 180.158 = 0.001165 mol
Thus, the moles are a) 3.935 and b) 0.001165 mol.
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Answer: 0.040 mol/l
Explanation: Molarity c = n/V (Concentration)
c = 0.060 mol / 1,5 l = 0,040 mol/l
Cloudy skies and precipitation. Rain is normally caused by water vapor within the condensation of the low pressure system.
A. Mass of the unknown gas.
The mass of the unknown gas is calculated by subtracting the weight of the empty flask from the mass when there was air in it.
m = 126.593 g - 125.623 g
Simplifying,
m = 0.97 grams
b. Molar mass of the gas
The molar mass of the gas is calculated by the ideal gas law.
PV = (m/M)RT
where P is pressure,V is volume, m is the mass, M is the molar mass, R is the universal gas constant, and T is temperature. Substituting the known values to the equation,
(733 mmHg/760 mmHg/atm)(0.20 L) = (0.97 g/M)(0.0821 L.atm/molK)(99 + 273.15 K)
The value of M in the equation is 153.64 g/mol.
<em>Answer: 153.64 g/mol</em>