What mass of h2 is needed to react with 8.75 g of o2 according to the following equation: o2(g) + h2(g) → h2o(g)? a: 0.547g h2 b: 1.10g h2 c: 4.38g h2 d: 17.5g h2

- B: is the right answer.

Solution:- The balanced equation is:

We have been given with 8.75 grams of oxygen and asked to calculate the grams of hydrogen needed to react with given grams of oxygen according to the balanced equation.

From balanced equation, 1 mole of oxygen reacts with 2 moles of hydrogen.

So, let's convert grams of oxygen to moles and multiply it by the mole ratio to calculate the moles of hydrogen that are easily converted to grams on multiplying by it's molar mass.

The complete set up looks as:

=

Hence, the right option is B: .

the answer is na (sodium)