Question

4 moles of water weighs=
1) 72 g
2) 36 g
3) 144 g
4) 18 g

Answer 1

1) 72g

Step-by-step explanation:

To find mass you need to use moles*mr

mr of H2O = 1+1+16 = 18

moles of H2O = 4

4*18 = 72

Answer 2

The weight of 4 moles of water is determined by multiplying the molar mass of water (18 g/mol) by 4, resulting in a total weight of 72 grams.

Step-by-step explanation:

The question asks for the weight of 4 moles of water. Using the concept of molar mass, we can determine the weight of a single mole of a substance. The molar mass of water (H2O) is approximately 18 grams per mole. Therefore, to find the weight of 4 moles of water, we multiply the molar mass of water by 4.

4 moles of H2O x 18 g/mole = 72 grams

Thus, 4 moles of water weigh 72 grams.