Alguien me ayuda a balancear estas ecuaciones quimicas 2. NaOH + NaHSO 4 Na 2 SO 4 + H 2 O
3. C 3 H 8 + O 2 CO 2 + H 2 O
4. Al + H 3 PO 4 Al PO 4 + H2
5. Al (OH) 3 + HNO 3 Al (NO 3 ) 3 + H 2 O
6. H 2 O 2 + PbS PbSO 4 + H 2 O
7. Fe 2 O 3 + C CO 2 + Fe
8. Al + Cl 2 AlCl 3
9. Mg 3 (PO 4 ) 2 + AlCl 3 AlPO 4 + MgCl 2
10. Pb (NO 3 ) 2 + NaI PbI 2 + NaNO 3

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

What is the wavelength of a 3*10^12 hz infrared wave a 3*10^20m b 1* 10^4m c 3*10^-3m d 1*10^-4 m

Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.