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
NARA [144]
3 years ago
7

Round off 808.57 to 4 significant figures.

Chemistry
1 answer:
Marysya12 [62]3 years ago
4 0

Answer:

808.6

Explanation:

You might be interested in
At a birthday pool party, the temperature is 28.50°C and the atmospheric pressure is 755.4 mmHg. One of the decoration helium ba
Iteru [2.4K]

Answer:

The volume of the balloon will be 5.11L

Explanation:

An excersise to solve with the Ideal Gases Law

First of all, let's convert the pressure in mmHg to atm

1 atm = 760 mmHg

760 mmHg ___ 1 atm

755.4 mmHg ____ (755.4 / 760) = 0.993 atm

922.3 mmHg ____ ( 922.3 / 760) = 1.214 atm

T° in K = 273 + °C

28.5 °C +273 = 301.5K

26.35°C + 273= 299.35K

P . V = n . R .T

First situation: 0.993atm . 6.25L = n . 0.082 . 301.5K

(0.993atm . 6.25L) / 0.082 . 301.5 = n

0.251 moles = n

Second situation:

1.214 atm . V = 0.251 moles . 0.082 . 301.5K

V = (0.251 moles . 0.082 . 301.5K) / 1.214 atm

V = 5.11L

7 0
3 years ago
Read 2 more answers
he number-average molecular weight of a polypropylene is 1,000,000 g/mol. Compute the degree of polymerization.
m_a_m_a [10]

Answer:

The answer is "23765.4"

Explanation:

Motor weight average number (\bar{M_n}) = 1000000 \frac{g}{mol}

Poly condensation degree dependent on the average number of molecular weights is as follows:

DP_n = \frac{\text{Mol.Wt Number Medium}}{\text{Monomer Unit Mol.Wt}}

All monomer module, in this case, is propylene  

Sunrise. Unit Wt = Mol. Propylene weight

                           = \ Mol. \ Wt \ of \ C_3H_6\\\\= 3 \times 12.01 +6 \times 1.008 \ \ \frac{g}{mol}\\\\= 42.078 \frac{g}{mol}\\\\

DP_n = \frac{1000000}{42.078}\\\\

    =23765.4

8 0
3 years ago
How much heat does an aluminum block absorb if 10.00 grams are heated from 25.0˚C to 50˚C? The specific heat of aluminum is .900
OverLord2011 [107]

Answer:

225

Explanation:

5 0
3 years ago
How many liters are in a 0.115 M solution containing 1.55 moles of dissolved KBr?
Anika [276]
13.48 is your answer.

M=moles/liters we have M=.115 and moles=1.55

Input those values into the equation
.115=1.55/L

Solve for L
1.55/.115=13.48
5 0
3 years ago
A 900 liter supply of xenon gas is held at 27 °C and 100 kPa. When the temperature is lowered to -73
svet-max [94.6K]
<h3>Answer:</h3>

300 kPa

<h3>Explanation:</h3>

Concept tested: Gas Laws (Combined gas law)

Initial pressure, P₁ = 100 kPa

Initial temperature,T₁ = 27°C

But, K = °C + 273, therefore, T₁ = 300 K

Initial volume, V₁ = 900 L

New temperature, T₂ = -73°C

                                   = -73°C + 273

                                   = 200 K

New volume, V₂ = 200 L             

We are required to calculate the new pressure, P₂

  • To find the new pressure of the gas, we are going to use the combined gas law;
  • Combined gas law combines both Charles's law and Boyle's law.
  • According to the combined gas law;

P₁V₁/T₁ = P₂V₂/T₂

  • To calculate the new Pressure, P₂, we rearranging the formula;

P₂ =(P₁V₁T₂) ÷ (V₂T₁)

Therefore;

P₂ = (100 kPa × 900 L × 200 K) ÷ (200 L × 300 K)

   = 300 kPa

Therefore, a pressure of 300 kPa must be applied.

6 0
3 years ago
Other questions:
  • What atomic component contributes to many of the trends of elements
    10·1 answer
  • 3cuso4 + 2al ------ 3cu + al2(so4)3 in the limiting reagent question above if you have 8.3 g of cuso4 and 20.1 g of al how many
    13·1 answer
  • Explain the importance of carbon's ability to form covalent bonds in straight chains, branched chains, or rings.
    15·1 answer
  • What did early scientists assume that the polar caps had in common?
    14·1 answer
  • Does it take faster for sugar or color (tint) to dissolve in water and WHY?
    6·1 answer
  • PLS HELPPP!!!!
    13·1 answer
  • What is the Answer of the picture
    9·2 answers
  • Is this true or false ?
    12·2 answers
  • Can someone help me sort this :(
    11·1 answer
  • Angry pomeranian x bones? broken\broccoli boy anyone?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!