the green substance in plants that takes in light from the sun to help them grow

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal

Ascientist measures the speed of sound in a monatomic gas to be 449 m/s at 20∘c. what is the molar mass of this gas?

Suppose that a certain fortunate person has a net worth of $71.0 billion ($7.10×1010). if her stock has a good year and gains $3.20 billion (3.20×109) in value, what is her new net worth?