<u>Answer:</u> The number of moles of ideal gas are 0.0037 moles
<u>Explanation:</u>
To calculate the mass of helium gas, we use the equation given by ideal gas:
PV = nRT
where,
P = Pressure of helium gas = 52 cmHg = 520 mm Hg (Conversion factor: 1 cm = 10 mm)
V = Volume of the helium gas = 137 mL = 0.137 L (Conversion factor: 1L = 1000 mL)
n = number of moles of gas = ?
R = Gas constant =
T = Temperature of helium gas = (Conversion factor: )
Putting values in above equation, we get:
Hence, the number of moles of gas is 0.0037 moles.
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Explanation:
Cu, Na and Nd are all elements.
A compound consists of at least 2 different elements.
Calcium chloride (CaCl2) consists of calcium and chlorine atoms, therefore it is a compound.