Question

Please do question 9 and 10

Answer 1

9) 60; 10) 0.2583

Step-by-step explanation:

9) M(SiO₂)=28+16*2=60 (gr/mol);

10) if one mole is in 60gr., then for 15.5 gr.:

1/60=x/15.5; ⇒ x=15.5/60≈0.2583(mol).