For the reaction C + 2H2 → CH4, how many grams of hydrogen are required to produce 4.1 moles of methane, CH4

Explanation:

Start by determining the mole ratio of CH4 and H2; it can be on these form and use the appropriate ratio depending on your desired unit;

1molCH42molH2

or

2molH21molCH4

Once known, multiply the value to the mole of CH4 as provided in the problem to find the mole of H2;

0.6 mol CH4 x## ?

Then, find the molar mass of H2 to use to find the mass of H2 needed to produce CH4.

The answer is 2.4 grams of H2

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.