3 years ago

Can someone help me with 18 to 22plz.

Chemistry

1 answer:

Likurg_2 [28]3 years ago

7 0

Answer:

18 True

19 True

20 False

21 True

Explanation:

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Convert 20 cals to J

zimovet [89]

Answer: 83.68 J

Explanation:

1 cal=4.184 J

1×20=4.184×20

20cals=83.68 J

8 0

3 years ago

PLEASE HELP!!!!!!!!!

KonstantinChe [14]

Answer:

Option "C" is the correct answer to the following question.

Explanation:

Given:

Pressure in an automobile tire (P) = 1.88 atm

Temperature (K) = 25°C = 273 + 25 = 298 Kelvin

New temperature (K1) = 37°C = 273 + 37 = 310 Kelvin

Find:

New pressure in an automobile tire (P1) = ?

Computation:

$\frac{P}{K}= \frac{P1}{K1} \\\\\frac{1.88}{298}= \frac{P1}{310}\\\\1.9557$

New pressure in an automobile tire (P1) = 1.9557

New pressure in an automobile tire (P1) = 1.96 (Approx)

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3 years ago

Which of the following is an example of how prosthetics engineering differs

Tcecarenko [31]

Answer:

A. Designing a device that is biologically compatible

Explanation:

4 0

3 years ago

a student fills a paper cup with water and puts it in a freezer over night.when she takes the cup out the next day, she notices

bazaltina [42]

Because water expands as it freezes

5 0

3 years ago

Determine the number of particles in 0.332 g of NaCl (molar mass NaCl=58.44 g/mol).

ira [324]

Answer:

3.42×10²¹ of particles

Explanation:

To determine the number of particles we should know, that:

1 mol of anything contains 6.02×10²³ particles

Therefore we have to find out, how many moles corresponds to 0.332 g of NaCl.

The conversion is: 0.332 g / 58.44 g/mol = 0.00568 moles

The rule of three to determine the number of particles is:

1 mol of NaCl has 6.02×10²³ particles

0.00568 moles must have (0.00568 . 6.02×10²³ particles )/1 = 3.42×10²¹

8 0

3 years ago