In 9 gram of Methane and 10 gram of ammonia which has a greater number of hydrogen molecule? plz help me to solve this

9 grams of methane contains a greater number of hydrogen atoms (therefore molecules) than 10 grams of ammonia

Explanation:

The number of atoms of hydrogen per molecule of ammonia = 3 atoms of hydrogen

The number of atoms of hydrogen per molecule of methane = 4 atoms of hydrogen

The molar mass of methane = 16.04 g/mol

The molar mass of ammonia = 17.031 g/mol

The number of moles of methane in 9 grams of methane = 9/16.04 ≈ 0.561 moles

The number of hydrogen atoms in 0.561 moles of methane = 0.561 × 6.02 × 10²³ × 3 ≈ 1.351 × 10²⁴ atoms of hydrogen

The number of moles of ammonia in 10 grams of ammonia = 10/17.031 ≈ 0.5872 moles

The number of hydrogen atoms in 0.5782 moles of ammonia = 0.5872 × 6.02 × 10²³ × 3 ≈ 1.06 × 10²⁴ atoms of hydrogen

Therefore, 9 grams of methane contains a greater number of hydrogen atoms than 10 grams of ammonia.

can you explain a little further maybe give multiple choice? ?

the earth’s crust is broken into separate pieces called tectonic plates (fig. 7.14). recall that the crust is the solid, rocky, outer shell of the planet. it is composed of two distinctly different types of material: the less-dense continental crust and the more-dense oceanic crust. both types of crust rest atop solid, upper mantle material. the upper mantle, in turn, floats on a denser layer of lower mantle that is much like thick molten tar.

each tectonic plate is free-floating and can move independently. earthquakes and volcanoes are the direct result of the movement of tectonic plates at fault lines. the term fault is used to describe the boundary between tectonic plates. most of the earthquakes and volcanoes around the pacific ocean basin—a pattern known as the “ring of fire”—are due to the movement of tectonic plates in this region. other observable results of short-term plate movement include the gradual widening of the great rift lakes in eastern africa and the rising of the himalayan mountain range. the motion of plates can be described in four general patterns:

collision: when two continental plates are shoved together

subduction: when one plate plunges beneath another (fig. 7.15)

spreading: when two plates are pushed apart (fig. 7.15)

transform faulting: when two plates slide past each other (fig. 7.15)