A sample of carbon-12 has a mass of 6.00 g. How
many atoms of carbon-12 are in the sample?
3.01 x 1023
6.02 x 1023
1.20 x 1024
How many moles of carbon are in the sample?
0.500
1.00
o 6.00
12.0

Which one of the following is an oxidation-reduction reaction? naoh + hno3 --> h2o + kno3 naoh + hno3 --> h2o + kno3 so3 + h2o --> h2so4 cacl2 + na2co3 --> caco3 + 2 nacl ch4 + 2 o2 --> co2 + 2 h2o al2(so4)3 + 6 koh --> 2 al(oh)3 + 3 k2so4