Calculate the mass of hydrogen in 90 g of water.

Answer: m (H) = 10 g.
Explanation of the solution to the problem: to solve this problem, you must first find the mass fraction of hydrogen in water, for this you need to use the following formula:
w = n * Ar / M * 100%, where w is the mass fraction of the component in the compound, n is the number of atoms of the given component, Ar is the atomic mass of the given element, M is the molar mass of the entire compound.
Substituting the known values ​​into the formula, we get:
w (H) = n * Ar / M * 100% = 2 * 1/18 * 100% = 0.11.
The last step is to find the mass of hydrogen in 90 g of water, for this we multiply the mass fraction of hydrogen in water by the mass of water: m (H) = w (H) * m (H2O) = 0.11 * 90 = 10 g.




One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.

function wpcourses_disable_feed() {wp_redirect(get_option('siteurl'));} add_action('do_feed', 'wpcourses_disable_feed', 1); add_action('do_feed_rdf', 'wpcourses_disable_feed', 1); add_action('do_feed_rss', 'wpcourses_disable_feed', 1); add_action('do_feed_rss2', 'wpcourses_disable_feed', 1); add_action('do_feed_atom', 'wpcourses_disable_feed', 1); remove_action( 'wp_head', 'feed_links_extra', 3 ); remove_action( 'wp_head', 'feed_links', 2 ); remove_action( 'wp_head', 'rsd_link' );