Chemistry, 19.12.2019 00:31 guapotaco8102
It is believed that two c-12 nuclei can react in the core of a supergiant star to form na-23 and h-1. calculate the energy released from this reaction for each mole of hydrogen formed. the masses of c-12, na-23, and h-1 are 12. u, 22.989767 u, and 1.007825 u, respectively. 126c + 126c →2311na + 11h 2.16 × 1015 kj
a. 2.16 × 105 kj
b. 2.16 × 1011 kj
c. 2.16 × 108 kj
d. 2.16 × 1014 kj
Answers: 3
Chemistry, 22.06.2019 19:00
How many moles of cu are needed to react with 5.8 moles of agno3? cu + 2 agno3 → cu(no3)2 + 2 ag
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Chemistry, 22.06.2019 21:40
A5 mole sample of liquid acetone is converted to a gas at 75.0°c. if 628 j are required to raise the temperature of the liquid to the boiling point, 15.600 kj are required to evaporate the liquid, and 712 j are required to raise the final temperature to 75.0°c, what is the total energy required for the conversion?
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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.
Answers: 2
It is believed that two c-12 nuclei can react in the core of a supergiant star to form na-23 and h-1...
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