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How many grams are in 4 moles of oxygen?
1. 16 g/mole
2. 64 g/mole
3. $6.02 xx 10^23$ g/ mole
4. $24.08 xx 10^23$ g/ mole
The mole is based on
1. speed of light.
2. Planck's constant.
3. pi.
Why is the mole important?
1. It gives us a convenient way to express large numbers.
2. It is useful when converting between grams and atoms or molecules.
3. It can be applied to any type of object: molecules, atoms, ions, etc.
4. All of the above.
How many moles are in 75.0 grams of nitrogen gas, $N_2$?
1. 3.00 moles
2. 0.333 moles
3. 2.68 moles
4. 4.52 moles
How many atoms are in 3 moles of $H_2O$?
1. 18 atoms
2. $6.02 xx 10^23$ atoms
3. $1.8 xx 10^24$ atoms
4. 1800 atoms
In the reaction $A + B rarr C + D$, if element B is in excess, then
1. element A is the limiting reactant.
2. element B is the limiting reactant.
3. element C is the limiting reactant.
4. element D is the limiting reactant.
1. $N_2S_3$
2. $N_2H_4$
3. $N_2O_3$
4. $N_2O_5$