Shouldn\'t it be 2H2 + O2 -> 2H2O? but how come in the picture i\'ve attached, i

Question

Shouldn't it be 2H2 + O2 -> 2H2O? but how come in the picture i've attached, it is 1 oxygen = 1 h2o

5. The density of water, H20(1), is 1.0 g/mL. How many atoms of oxygen are present in 2.5 L of pure water? A) 8.4 x 10^25 B) 1.4 x 10^21 C) 2.3 x 10^-22 D) 1.5 x 10^27 E) 2.7 x 10^26 The mass of 2.5 L of water is mass = dV = 1.00 g mL^-1 x 2500 mL = 2500 g Note the conversion from L to mL (1 L = 1000 mL). The amount of water is thus 2500 g Moles of H_2O= m_H2O/M_H2O = 2500 g/ 18.015 g mol^-1=13_8 mol Multiplying by the Avogadro constant gives the number of water molecules which equals the number of oxygen atoms since there is one oxygen atom per water molecule. number of O atoms = 13_8 x 6.022x1023 atoms ml^-1 = 8.4x10^25 Shouldn't it be 2H2 + O2 -> 2H2O? but how come in the picture i've attached, it is 1 oxygen = 1 h2o

Explanation / Answer

One molecule of H2O has one atom of O. Please understand the difference between atom and molecule O --> atom O2 --> molecule

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