Calculate the number of moles in each of the following :

A) 4.5 moles

B) 0.5 moles

Explanation:

A) We want to find the Number of moles in 180 g of Ca.

Now, atomic mass of calcium is M = 40.08 g/mol

Formula for number of moles is;

n = m/M

n = 180/40.08

n ≈ 4.5 moles

B) we want to find the Number of moles in 32g of SO2.

Atomic mass of SO2 = 64.066 g/mol

Similar to answer A above;

n = 32/64.066

n ≈ 0.5 moles

43.452

step-by-step explanation:

284 times .153 = 43.452

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