Question

You have three molecules of glucose (3C6H12O6). How many carbon atoms do you have?

A. 3

B. 6

C. 18

D. 36
**MY answer: C. 18

Which of the following is a homogenous mixture of two or more pure substances?
A. oxygen
B. water
C. air
D. alcohol
**MY answer: D. alcohol

are they correct???

Answer 1

1) The correct answer is option C.

2) the correct answer is option C.

Step-by-step explanation:

1) Molecular formula of glucose =
`C_6H_(12)O_6`

Number of carbon atoms in single molecule = 6

Number of carbon atoms in 3 molecule of glucose :

`(6)/(1)* 3=18 atoms` of carbon

There are 18 carbon atoms in the 3 molecules of glucose.

2) Homogeneous mixture is the mixture in which components are evenly distributed throughout the mixture. The shape and size of the particles are identical in the mixture.

Heterogeneous mixture is the mixtures in which component are unevenly distributed throughout the mixture. The shape and size of the particles are not identical in the mixture.

Air is the mixture of gases with 78% of nitrogen gas, 21% of oxygen gas and remaining 1 % are other gases. Air is a homogeneous mixture of different gases.

Where as water, oxygen , alcohol are pure substances.

Answer 2

You have three molecules of glucose (3C6H12O6). How many carbon atoms do you have?C. 18
Your answer is correct

Which of the following is a homogenous mixture of two or more pure substances?
C. air
Your answer is wrong.