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artcher [175]
3 years ago
12

I REALLY REALLY NEED HELP CAN SOMEONE HELP ME ANSWER ALL OF THE QUESTION PLZ

Chemistry
1 answer:
zimovet [89]3 years ago
3 0
Number eight is water, wind, and erosion
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How many atoms are in 20.6 moles of curium
Harman [31]

Answer: 1.24 × 10^25

Explanation:

\frac{20.6 moles}{1} × \frac{6.022 * 10^{24} }{1 Mole}

Using our knowledge in unit conversions, we know the mole units cancel each other out and all there's left is the atom unit. From here we can multiply the fractions and eventually we end with the number 124.0532 × 10^23

According to the scientific notation rules, the number to the left of the decimal cannot exceed 10 so we have to move the decimal to the left two spaces. With this change, we also have to change the exponent of the 10. Because we moved the decimal point two spaces to the left, that means we have 10^25.

4 0
3 years ago
What would be the volume of 0.500 mole of an ideal gas at a temperature of 273.15 Kelvins and 1 atm?
uysha [10]

Answer:

V = 11.21 L

Explanation:

Given data:

Volume of helium = ?

Number of moles = 0.500 mol

Temperature = 273.15 K

Pressure of gas = 1 atm

Solution:

Formula:

PV = nRT

R = general gas constant = 0.0821 atm.L/ mol.K

V = nRT/P

V = 0.500 mol ×  0.0821 atm.L/ mol.K  × 273.15 K / 1 atm

V = 11.21 L / 1

V = 11.21 L

8 0
3 years ago
Please help me !!!!!!!!! <br> i'll give brainlist !
qwelly [4]

Answer:

A-B

C-D

E-F

I think it's these because Potential Energy increase when the graph increases and remain constant when the graph is flat.

8 0
3 years ago
Ionising radiation is emitted all the time by __________ sources. What one word completes the sentence?
sveticcg [70]

Answer:Radioactive substances give out radiation all of the time. There are three types of nuclear radiation: alpha, beta and gamma. Alpha is the least penetrating, while gamma is the most penetrating. Nonetheless, all three are ionising radiation: they can knock electrons out of atoms and form charged particles.

8 0
3 years ago
A group of students are making a sign that is 3 meters long. If each student works on 20 cm of the sign how many students can wo
Pavlova-9 [17]

Answer:

15 students

Explanation:

20 cm = 1 student

3 metres in cm = 300 cm

300 / 20 = 15 students

4 0
3 years ago
Read 2 more answers
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