. Answer the following questions. How many days old will you be on your 16* birthday? (ignore leap years)。 56 の 2】 How many heartbeats are there in the lifetime ofan average person? (The average person's heartbeat is 70 per minute and average lifespan is 70 years). The molar mass of water is 18 gmo!. How many molecules of water are there in a glass of water (mass of water 300 g)? (1 mole = 6.022 x 1073 molecules) What is the volume in cubic meters ofa cube of side 2.8 cm? How long does it take for light to travel across the diameter of the solar system? (Diameter of the solar system is 287.46 billion km).