1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kherson [118]
4 years ago
10

Compute 3.5×4.48697. Round the answer appropriately. Express your answer numerically using the proper number of significant figu

res.
Chemistry
2 answers:
Sergio [31]4 years ago
7 0
15.7044 is the answer. You need the same number of numbers as the largest number in your problem. In this case there is one number less because you are rounding up from 9
Taya2010 [7]4 years ago
3 0
16 because the actual answer is 15.704395 then u round the .7 because it greater than 5 making it 16
You might be interested in
Dimethyl sulfoxide [(ch3)2so], also called dmso, is an important solvent that penetrates the skin, enabling it to be used as a t
Bas_tet [7]

The molecular formula of dimethyl sulfoxide is (CH_{3})_{2}SO. Molar mass of dimethyl sulfoxide is 78.13 g/mol. Calculate number of moles as follows:

n=\frac{m}{M}=\frac{7.14\times 10^{3} g}{78.13 g/mol}=91.38 mol

From the molecular formula, 1 mole of dimethyl sulfoxide contains 2 moles of Carbon, 6 moles of Hydrogen, 1 mole of Sulfur and 1 mole of oxygen.

Thus, 91.38 moles of dimethyl sulfoxide will have:

Carbon :

n_{C}=2\times 91.38 moles=182.77 moles

Hydrogen:

n_{H}=6\times 91.38 moles=548.28 moles

Sulfur:

n_{S}=1\times 91.38 moles=91.38 moles

Oxygen:

n_{O}=1\times 91.38 moles=91.38 moles

Since, 1 mole of an element equals to 6.023\times 10^{23} atoms thus, number of atoms can be calculated as:

Carbon:

1 mole\rightarrow 6.023\times 10^{23} atoms

Thus,

182.77 moles\rightarrow 182.77\times 6.023\times 10^{23} atoms=1.10\times 10^{26} atoms

Hydrogen:

1 mole\rightarrow 6.023\times 10^{23} atoms

Thus,

548.28 moles\rightarrow 548.28\times 6.023\times 10^{23} atoms=3.30\times 10^{26} atoms

Sulfur:

1 mole\rightarrow 6.023\times 10^{23} atoms

Thus,

91.38 moles\rightarrow 91.38\times 6.023\times 10^{23} atoms=5.50\times 10^{25} atoms

Oxygen:

1 mole\rightarrow 6.023\times 10^{23} atoms

Thus,

91.38 moles\rightarrow 91.38\times 6.023\times 10^{23} atoms=5.50\times 10^{25} atoms

Therefore, number of C, S, H and O atoms are 1.10\times 10^{26}, 5.50\times 10^{25}, 3.30\times 10^{26} and 5.50\times 10^{25} atoms respectively.

4 0
4 years ago
2. What mass of water absorbs 6700 J of heat to raise the temperature from 283K to 318K?​
Alexxandr [17]

Answer:

Q = mcT ...you can either substitute the molar heat capacity of water in the place of c or the specific heat capacity of water.

Explanation:

7 0
3 years ago
Jeffrey is on his skateboard and starts skating down a ramp. Ten seconds later he is travelling at
AfilCa [17]

Answer: 2m/s^2

Explanation:

Velocity of skateboard = 20.0 m/s.

Time taken = Ten seconds (10 s)

Acceleration ​= ?

Recall that acceleration is the change in velocity of a body per unit time.

i.e Acceleration = (velocity / Time)

Acceleration = 20.0m/s ➗ 10 s

Acceleration = 2m/s^2

Thus, Jeffrey acceleration was 2m/s^2

7 0
4 years ago
What is the word equation for atoms of magnesium reacting with molecules of oxygen to produce magnesium oxide?
Kazeer [188]

Answer:

The "word equation" is Magnesium + Dioxygen → Magnesium Oxide

Explanation: This is also the same as Mg + O₂ → MgO.

5 0
2 years ago
See if you can think of a way to prove that it is the oxygen in air, not nitrogen, that causes rusting.
allsm [11]

Answer:

rusting occur in oxygen and water coz when you put a nail into the water and you leave it three days you will the nail become brownish and that is due to oxygen and water

8 0
3 years ago
Other questions:
  • Calculate the number of moles of C2H6 in 6.29×1023 molecules of C2H6.
    14·1 answer
  • How does the behavior of the water molecules change as the pan of water is heated?
    9·1 answer
  • Arrange the steps in order to describe what happens to a gas when it cools. The A particles of gas move slower.
    9·2 answers
  • What is different about Venus’s rotation
    12·1 answer
  • BRAINLIESTTT ASAP! PLEASE HELP ME :)
    8·1 answer
  • 10. Many cooking pans are made of aluminium although it is a reactive metal, Explain.​
    5·1 answer
  • What is bias in an experiment?
    7·1 answer
  • Two LIKE charges (+ and +, or - and -) will move __________________ each other ???
    9·1 answer
  • What is a variable?
    11·1 answer
  • Chemistry - Atoms Unit
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!