Densities of some common substances Solids (at 25 C) Density (g/cm3 or g / mL) L

Question

Densities of some common substances Solids (at 25 C) Density (g/cm3 or g / mL) Liquids (at 25 C) Density (g/mL ) Gases (at 0 C, 1 atm) Density (g/L ) Cork 0.26 Gasoline 0.74 Hydrogen 0.090 Ice (at 0 C) 0.92 Ethanol 0.785 Helium 0.179 Sugar 1.59 Olive oil 0.92 Methane 0.714 Salt (NaCl) 2.16 Water (at 4 C) 1.00 Neon 0.902 Aluminum 2.70 Milk 1.04 Nitrogen 1.25 Diamond 3.52 Mercury 13.6 Air (dry) 1.29 Iron 7.86 Oxygen 1.43 Copper 8.92 Carbon dioxide 1.96 Silver 10.5 Lead 11.3 Gold 19.3

A cannonball made of iron has a volume of 121 cm3. What is the mass, in kilograms, of the cannonball? Express your answer to three significant figures and include the appropriate units.

A balloon filled with helium has a volume of 8.7 L. What is the mass, in grams, of helium in the balloon? Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

density of helium = 0.179 g/L, mass of helium= density* Volume= 0.179*8.7 =1.5573 gm

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