Question

How many molecules are contained in each of the following (scientific Notation)

2.66 mol S8

0.799 mol NH3

10.5 g of C2H5OH

1292 g of Cl2

Answer #1

We know that 1 mole of any molecule contains Avogadros number of molecules

Avogadros Number = 6.023 x 10^{23}

So

1)

2.66 mol S_{8} = 2.66 x 6.023 x 10^{23} = 1.60 x
10^{24} molecules

2)

0.799 mol NH_{3} = 0.799 x 6.023 x 10^{23} =
4.812 x 10^{23} molecules

3)

10.5 g of C_{2}H_{5}OH

We know Mol = mass / molar mass

So mole of C_{2}H_{5}OH = 10.5 g/46.07 g/mol =
0.228 moles

0.228 mole = 0.228 x 6.023 x 10^{23} = 1.373 x
10^{23} molecules

4)

1292 g of Cl_{2}

So moles of Cl_{2} = mass of Cl_{2} /molar mass
of Cl_{2}

= 1292 g / 35.45 g/mol

= 36.45 mol

36.45 mol = 36.45 x 6.023 x 10^{23} = 2.19 x
10^{25} molecules

how many molecules of S8 will be needed to produce 30.0g of S3O8
?

How many moles of atoms are contained in each of the
following?
a.) 7.65 x 10^24 N2 molecules
b.)22.1 g of Mg.

Express 0.000000000135 in scientific notation.
Express 5690000000 in scientific notation
How many significant digits does 705.001 have?
A motorcycle is traveling at a speed of 38 m/s. What is its
speed in km/hr?
A common speed limit in British Columbia is 80 km/hr. What is
this speed in m/s?
Considering significant figures, what is the area of a
rectangle that is 5.7 m by 9.28 m?

Student Exercise 1 Convert each of the following numbers from
standard notation to scientific
notation.
a. 5268 b. 0.00689
Student Exercise 2 Convert each of the following numbers from
scientific notation to standard
notation.
a. 7.21*10 to the 3rd power
b. 7.21*10 to -3rd power
Student Exercise 3 Write each of the calculator display numbers
in scientific notation and in standard
notation.
a. 5.697E-4 b. 5.6 97 E4

1.how many molecules are contained in a 5.85 g sample
of dimethylmercury
2. what is the percentage of mercury (by mass) in the
sample

1) How many grams of NH3 can be produced from 4.48 mol of N2 and
excess H2.
Express your answer numerically in grams.
2) How many grams of H2 are needed to produce 11.93 g of
NH3?
Express your answer numerically in grams.
3)How many molecules (not moles) of NH3 are produced from
4.38×10−4 g of H2?
Express your answer numerically as the number of molecules.

Question 1
How many significant figures in the following measurement?
0.0021
Question 2
How many significant figures in the following measurement?
3.505
Question 3
How many significant figures in the following measurement?
0.0320
Question 4
Add the two masses together and report the answer to correct
significant figures. (Do not use scientific notation.)
12.011 + 1.01 =
Question 5
Use the molar mass of carbon (12.011 g/mol) to calculate the moles
in 5.0 g of carbon to correct significant figures....

Given 1 mol of each gas listed, complete the following table:
Gas Molecules Mass Volume at STP nitrogen, N2 ? ? ? hydrogen
fluoride, HF ? ? ? ammonia, NH3 ? ? ?
State the number of molecules for 1 mol of nitrogen, N2.
State the mass for 1 mol of nitrogen, N2. Express your answer to
two decimal places and include the appropriate units.
State the volume at STP for 1 mol of nitrogen, N2.
State the number of...

1- How many grams of H2S contain the same number of molecules as
13.9 g of BH3?
2- how many moles of n atoms are contained in 12 mol n2o5?
3- Refer to the periodic table and determine how many grams of
sulfur contain the same number of atoms as 8.99 grams of
phosphorus.
________g

How many grams of solid NaOH (Mol. Wt. = 40 g mol-1) must be
added to a 0.15 L solution of 0.02 mol L–1 glycine hydrochloride to
adjust the pH to 2.65? (pKa1 = 2.35, pKa2 =
9.78)
(A) 79.92 g
(B) 7.992 g
(C) 0.799 g
(D) 0.079 g
(E) 0.008 g

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 1 minute ago

asked 1 minute ago

asked 1 minute ago

asked 1 minute ago

asked 1 minute ago

asked 2 minutes ago

asked 2 minutes ago

asked 2 minutes ago

asked 2 minutes ago

asked 5 minutes ago

asked 5 minutes ago

asked 6 minutes ago