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Lemur [1.5K]
2 years ago
12

(pls help!) What mass of oxygen atoms is required to react completely with 30 u of hydrogen atoms?​

Chemistry
2 answers:
Nataly [62]2 years ago
6 0
  • 2H_2+O_2—»2H_2O

One mole Hydrogen need 1/2mol O_2 .

Moles of Hydrogen

  • 30u/1u
  • 30mol

Moles of O_2

  • 30/2
  • 15mol

Nikolay [14]2 years ago
6 0

\qquad\qquad\huge\underline{{\sf Answer}}

Let's get to the reaction first ~

\qquad \qquad \rm 2H_2 + O_2  \rightarrow 2H_2O

Here, we can infer that if we need 1 mole oxygen gas to react with 2 moles Hydrogen gas.

So, the number of Oxygen gas molecules we need to react should be half the number of Hydrogen gas molecules.

Number of Hydrogen gas molecules is :

\qquad \sf  \dashrightarrow \:  \dfrac{30}{2}

\qquad \sf  \dashrightarrow \:  15

Number of Oxygen gas molecules needed is :

\qquad \sf  \dashrightarrow \:   \dfrac{15}{2}

Number of Oxygen atoms needed :

\qquad \sf  \dashrightarrow \:   \dfrac{15}{2}  \times 2

\qquad \sf  \dashrightarrow \:  {15} \: atoms

One atom of Oxygen weight 16 u, so 15 atoms weight ~

\qquad \sf  \dashrightarrow \:  {15} \times 16

\qquad \sf  \dashrightarrow \:  240 \: u

So, we need 240 u of Oxygen atoms to react completely with 30 u of Hydrogen atoms.

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