How many grams of h2 are needed to react completely with 44.1 grams of c? c + h2 yields ch4 be sure to balance the equation. 7.40 grams 14.7 grams 88.2 grams 132 grams?

Answer is 14.8 g. (according to the given choices, 14.7 g can be taken as the correct answer.)

Explanation;

The balanced reaction is

C(s) + 2H₂(g) → CH₄(g)

Moles (mol) = mass (g) / molar mass (g/mol)

Mass of C = 44.1 g

Molar mass of C = 12.01 g/mol

Hence,

moles of C = 44.1 g / 12.0 g/ mol

= 3.7 mol

The stoichiometric ratio between C and H₂ is 1 : 2.

Hence,

moles of H₂ reacted = moles of C reacted x 2

= 3.7 mol x 2

= 7.4 mol

Molar mass of H₂ = 2.0 g/mol

Hence,

mass of H₂ reacted = moles x molar mass

= 7.4 mol x 2.0 g/mol

= 14.8 g

assuming that your periodic table has eighteen columns, you should highlight   the four elements in the third column from the left of the table.

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the have energy higher than those in the orbital while lower than those of the orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the orbital is therefore filled right after orbitals and before orbitals.  

potassium has electron configuration and calcium . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the and should be highlighted as well.