Multiple Choice
How many moles of He gas are present in 500 L at standard temperature and pressure (STP)?
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Mole Concept
Multiple Choice
How many moles are present in 55 g of NaCl?
A
1.5 moles
B
0.94 moles
C
0.47 moles
D
2.1 moles
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Verified step by step guidance1
Identify the given quantity and what is asked: You have 55 grams of NaCl and need to find the number of moles.
Recall the formula to convert grams to moles: \(\text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}}\).
Calculate the molar mass of NaCl by adding the atomic masses of sodium (Na) and chlorine (Cl): \(\text{Molar mass of NaCl} = 22.99 + 35.45\) g/mol.
Substitute the values into the formula: \(\text{moles} = \frac{55}{\text{molar mass of NaCl}}\).
Perform the division to find the number of moles present in 55 g of NaCl.
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