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melomori [17]
3 years ago
15

There are 18 students in Mr. Alvarez’s art class. Throughout the year, every student must pair up with every other student to co

mplete a project. How many projects will be finished?
A. 149 projects
B. 153 projects
C. 171 projects
D. 135 projects
Mathematics
1 answer:
Anna35 [415]3 years ago
5 0
To my knowledge it would be:
B. 153 projects
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The molar mass of AlCl3 is 133.34 g/mol. How many molecules of AlCl3 are there in 2 g?
Mnenie [13.5K]

To solve this problem, we have to apply mole-concept to this and we would need the molar mass of AlCl3.  2g of AlCl3 contains 9.034*10^21 molecules.

<h3>Number of Molecules in 2g of AlCl3</h3>

The molar mass of AlCl3 is given as 133.34g/mol

Data;

  • mass = 2g
  • molar mass = 133.34g/mol

Using the mole concept, we can equate the molar mass to the number of molecules present in the entity.

133.34g = 6.023*10^2^3

If we equate this

133.34g = 6.023*10^2^3\\2g = x molecules\\x = \frac{2*6.023*10^2^3}{133.34} \\x = 9.034*10^2^1 molecules

From the calculations above, 2g of AlCl3 contains 9.034*10^21 molecules.

Learn more on mole concept here;

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5 0
2 years ago
Round 1,129.872 to the nearest hundred
sp2606 [1]
1,129.872 to the nearest hundred is 1,100
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3 years ago
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The product of 6<br> and the sum of five<br> and a number
Vaselesa [24]

Answer:

6 * (5 + n)

Explanation:

Sum = addition

Difference = subtraction

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1 year ago
I'll give brainliest!!!!
Anna [14]

Answer: B

Step-by-step explanation:

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Jason wrote this expression to describe the total amount he will spend on a magazine and a book.
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The 11 may represent the price of the magazine if all the magazines at a certain store are $11. Then the s may represent the price of a book because all the books at a bookstore are different prices.

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