How many grams of sodium chloride are needed to make 17.5g of sodium?

Answer : The mass of needed are, 44.5 grams.

Explanation :

First we have to calculate the moles of Na.

Now we have to calculate the moles of NaCl.

The balanced chemical reaction is:

From the reaction, we conclude that

As, 2 mole of produces from 2 mole of

So, 0.761 mole of produces from 0.761 mole of

Now we have to calculate the mass of

Molar mass of = 58.5 g/mole

Therefore, the mass of needed are, 44.5 grams.

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

answer; capital earns interest; entrepreneurship receives a profit or incurs a loss;