Skip to Content Go to sign in Skip to Primary Navigation Skip to Secondary Navigation Skip to Page Navigation Skip to Header Navigation Skip to Footer Navigation Read more about accessability options and our navigation

Physics Classroom is making strides to make our site accessible to everyone. Our site contains 6 navigation areas. The Primary, Secondary, and Page Level navigations have a screen reader version of their nav structure that allows using the left and right keys to navigate sibling navigation items, and up or down keys to navigate parent or child navigation items. The others can be navigated using tabs. The Primary Navigation handles the first 2 levels of site pages. The Secondary (which is not always available) handles the 3rd and 4th level of structure. The Page level navigation allows you to navigate the current page's headings quickly. The Header Navigation contains the Light/Dark Mode toggle, Search, Notifications and account login. The Breadcrumb Navigation contains the breadcrumb of the current page. If the current page has a breadcrumb, you can get to it by skipping to the content and tabbing in reverse (shift plus tab). The Footer Navigation contains links such as Privacy, Contact, about and terms. Some resources contain an Audio Player that can be activated by holding down the T key for 3 seconds, and then using K to pause and resume. While not every area of Physics Classroom is usable purely from keyboard and screen reader, we are committed to continue work on making this possible. If you have questions or need additional help, please use this link to contact us.

Return to screen reader navigation
Home Concept Builders Mole Molar Mass Directions

Molar Mass - Directions

Using the Molar Mass Concept Builder is quite simple. There are three different activities, each with their own set of directions. In the first activity - Counting Atoms - you will be presented with the chemical formula for a compound having three or more elements. For each element, you will have to determine the number of atoms of that element present in the compound. You can enter your answer directly into the answer field or use the pop-up Number Pad to enter your answer. Access the pop-up Number Pad by tapping on the icon to the right of the answer field. Once you are done with the Number Pad, tap on the Enter button or the Tap to Close button. When you are satisfied with your answers, tap on the Check Answers button. Your answers will be evaluated and feedback will be given. Your Scoreboard will be updated and a new question will be presented.

The second and the third activities are very similar to on another. You are given a formula for a compound with three or more elements. You will have to determine the number of atoms of each element, the mass (on a g/mol basis) of those atoms, and the overall molar mass of the compound. You can enter your answers by tapping on a table cell. A Number Pad pops up. You can use the Number Pad to enter answers into the table cell. Once complete, you can tap the Tap to Close button (at the bottom of the number pad) or the Enter button or tap on a different table cell to enter or edit its value. Once you are satisfied with your answers, tap on the Check Answers button. Your answers will be evaluated and feedback will be given. Feedback is given in terms of color-coded table cells. Table cells color-coded green were correctly answered and cannot be changed again. If an answer is incorrect, then the table cell will be color-coded red. There's no limit on the number of misses ... other than the time that it takes to make all those misses.

The third activity uses fictional elements from the Planet Mayedup. You can tap on the View Periodic Table button to view the atomic mass of each element. You will need to use these mass values to calculate the atomic mass.

Concept Builder Teacher Notes