# Recent questions tagged chemistry

+1 vote
Given the following equation.

$8 Fe +S_8 \rightarrow 8 FeS$

What mass of iron is needed to react with 16 g of sulfur?

+1 vote
Given the following equation

$Na_2O + H_2O \rightarrow 2NaOH$

How many grams of NaOH is produced from 1.2 x 102 grams of Na2O?

Given the following equation.

$2 K +Cl_2 \rightarrow 2KCl$

How many grams of KCl is produced from 2.5 g of K and excess Cl2?

Given the following equation.

$2 KClO_3 \rightarrow 2KCl +3O_2$

How many moles of O_2 can be produced by letting 12.00 moles of KClO3 react?

Which of the following molecules has a dipole moment of zero?

A) C6H6 (benzene)

B) NO

C) SO2

D) NH3

E) H2S