B. compound
source is Glencoe Science book grade 7.
Also I just happening to be learning about this at school
When 2.50 g is burned then in oxygen then 1.25kj of heat is produced.
Silver/Electron configuration
[Kr] 4d¹⁰ 5s¹
Atomic number: 47
Symbol: Ag
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Answer:
A). 92.02g
Explanation:
Equation of the reaction;
N2 (g)+ 2O2(g)------> 2NO2(g)
Note that the balanced reaction equation is the first step in solving any problem on stoichiometry. Once the reaction equation is correct, the question can be easily solved.
Reaction of one mole of nitrogen gas with two moles of oxygen gas yields two moles of nitrogen dioxide.
Mass of two moles of nitrogen dioxide= 2[14 + 2(16)] = 2[14+32]= 2[46]= 92 gmol-1
Therefore; Mass of two moles of nitrogen dioxide is 92
I'm pretty sure all 4 are subatomic particles but if i had to guess i'd be Photons
