Question

4.0 moles of H2O would have what mass

Answer 1

The answer is 0.055508435061792.
We assume you are converting between moles H2O and gram.
You can view more details on each measurement unit:
molecular weight of H2O or grams
This compound is also known as Water or Dihydrogen Monoxide.
The SI base unit for amount of substance is the mole.
1 mole is equal to 1 moles H2O, or 18.01528 grams.

Answer 2

Answer:

$given \\ moles \: of \: water (n) = 4.0 \\ molarmass(mr) = 18 \\ from \\ n = \frac{m}{mr} \\ n \times mr = m \\ m = mr \times n \\ 18 \times 4.0 \\ 72g$