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Evgesh-ka [11]
2 years ago
6

please help.. Which of the following events is most likely to cause an environmental disturbance in a grassland biome? A. Earthq

uake B.volcanic eruption C. hurricane D. fire caused by lightning
Chemistry
1 answer:
Vlad [161]2 years ago
5 0

Answer:

D. Fire caused by lightning

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What is the concentration of no3- ions in a solution prepared by dissolving 15.0 g of ca(no3)2 in enough water to produce 300. m
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Ca(NO3)2 -------> Ca²⁺ +2NO3⁻

M(Ca(NO3)2)= M(Ca) + M(N) + 6M(O)= 40.0 +14.0 +6*16.0 = 150 g/mol

15.0 g Ca(NO3)2 * 1mol/150 g = 0. 100 mol Ca(NO3)2


Ca(NO3)2 -------> Ca²⁺ +2NO3⁻
1 mol                               2 mol
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We have 0.2 mol NO3⁻ in 300. mL=0.300 L of solution,
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0.200 mol NO3⁻ / 0.300 L solution ≈ 0.667 mol NO3⁻ /L solution = 0.667 M

Concentration of NO3⁻ is 0.667 M.



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