5. The relative atomic mass of elements X, Y and Z are 12, 16 and 24 respectively. a) How much is an atom of Z heavier than an atom of Y
b) How many atoms of X will have the same mass as the sum of 3 atoms of Y and 2 atoms
of Z?

6. Adrenaline is produced by the adrenal gland. Adrenaline has the formula C9H13NOx. If its RMM is 183, determine the value of x. Then, write the molecular formula of adrenaline.
[Relative atomic mass: H=1; C=12; N=14; O=16]

7. The relative formula mass of X3(PO4)2 is 310. Determine the relative atomic mass of element X.
[Relative atomic mass: O=16; P=31]

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Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

In a reaction equation, where are the products located? a.) above the arrow b.) to the right of the arrow c.) to the left of the arrow d.) below the arrow