Can someone point out what i did wrong in a and d. a is going from mole to mole. and d is going from mole to gram.

16.96 moles of sodium will needed to react with 4.24 moles of oxygen gas.

Explanation:

Moles of oxygen gas = 4.24 moles

According to reaction , 1 mole of oxygen gas reacts with 4 moles of sodium.

Then 4.24 moles of oxygen gas will react with :

of sodium

16.96 moles of sodium will needed to react with 4.24 moles of oxygen gas.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e