[exige]

1) If you stacked Avogadro's number of pennies one on top of the other on Earth's surface, how far would the stack extend (in km)? [For comparison, the sun is about 150 million km from Earth and the nearest star (Proxima Centauri) is about 40 trillion km from Earth.](A penny has a thickness of approximately 1.0 mm). Put in 4 sig figs.

i got 60.20*10^17 but it doesnt seem right..

2)Find the number of automobiles whose total mass is the same as 1.0 mols blueberries. (The mass of an average blueberry is 0.73g and the mass of an automobile is 2200kg).Put in two sig figs.

i tried part of this and changed the 2200kg to 2200000g, but then after that i didnt know what to do...

3)How many titanium atoms does it contain? Titanium has a density of 4.50g/cm^3. (A pure titanium cube has an edge length of 2.68 in)

[Schrödinger]

1. Avogadro's number = 6.022*10^23. The answer would be 6.022*10^17.
   Method :
   Thickness of ene penny = 1mm = 10^-6 km
   Total height of stack = (Avogadro's number) * (thickness of one penny)

2. Method : Find mass of one mole of blue berries. (in grams/kilograms)
    Divide that by the mass of one car (grams/kilograms, but it should match with the
   units chosen above) to get number of cars.

3.

3)How many titanium atoms does it contain? Titanium has a density of 4.50g/cm^3. (A pure titanium cube has an edge length of 2.68 in)

does what contain?