Question

If a plant needs 14.9 g of glucose how many grams of water are needed

Answer 1

8.856 grams of water is needed by the plant to make 14.9 grams of glucose.

Step-by-step explanation:

Data given

mass of glucose needed by plant = 14.9 grams

mass of water needed =?

balanced chemical equation:

6C
`O_(2)` + 6
`H_(2)`
`O_{}` ⇒
`C_(6)H_(12) O_(6)` + 6
`O_(2)`

molar mass of glucose = 180.15 grams/mole

number of moles =
`(mass)/(molar mass)`

number of moles =
`(14.9)/(180.15)`

number of moles= 0.082 moles

from the equation:

1 mole of glucose is produced by 6 moles of water

0.082 moles of glucose is produced by x mole of water

`(6)/(1)` =
`(x)/(0.082)`

x = 0.492 moles of water

atomic mass of water = 18 grams/mole

mass of water required = number of moles x atomic mass of water

mass of water = 0.492 x 18

= 8.856 grams