Question

number of moles in 1.8g of H2O is equal to number of moles in 1)18g glucose,2) 6g urea or 3)34.2g sucrose

Answer 1

all answers are correct
moles of H₂O present in 1.8 g is=1.8/18=0.1
now
1.) moles present in 18g glucose =18/180=0.1
2.)moles present in 6g urea =6/60=0.1
3.)moles present in 34.2 sucrose=34.2/342=0.1 

Answer 2

Answer:  1)18g glucose , 2) 6g urea and 3)34.2g sucrose

Explanation: The moles are calculated by using the formula:

$Moles=\frac{\text{Given mass}}{\text{Molar mass}}$  

Moles of $H_2O=\frac{1.8}{18g/mol}=0.1mole$  

1) 18g glucose:

Moles of glucose=$\frac{18}{180g/mol}=0.1mole$  

2) 6g urea:

Moles of urea=$\frac{6g}{60g/mol}=0.1mole$  

3) 34.2g sucrose:

Moles of sucrose=$\frac{34.2g}{342 g/mol}=0.1mole$