Multiple Choice
If seawater contains 3.2 × 10^{-9} g of gold per liter, how many grams of gold are present in 1.00 L of seawater?
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2. Atoms & Elements
Calculating Molar Mass
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What is the mass of 4 moles of helium (He)?
A
8 g
B
16 g
C
4 g
D
44 g
Verified step by step guidance1
Identify the molar mass of helium (He) from the periodic table. Helium has an atomic mass of approximately 4 grams per mole.
Understand that the mass of a substance can be calculated using the formula: \(\text{mass} = \text{number of moles} \times \text{molar mass}\).
Substitute the given number of moles (4 moles) and the molar mass of helium (4 g/mol) into the formula: \(\text{mass} = 4 \text{ moles} \times 4 \text{ g/mol}\).
Multiply the values to find the total mass of helium for 4 moles.
Interpret the result as the mass of 4 moles of helium in grams.
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