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3 years ago

Fill in the blank: You can find the number of __________ in any atom by subtracting the atomic number from the mass number.

1 answer:

5 0

B is true if we subtract atomic number(the number of protons )from the mass number
we can find neutrons.
hope this helps

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Round off each of the following numbers to two significant figures:

VashaNatasha [74]

A) 0.44
B) 9.0
C) 27.
D) 1.4 x 10^2
E) 1.5 x 10^-3
F) 0.45

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3 years ago

Why is the time series useful as a management tool?

katrin [286]

Answer:

Explanation:

It estimates the probability of extinction.

8 0

3 years ago

when a person uses an iron to remove the wrinkles from a shirt, why does heat travel from the iron to the shirt?

valentina_108 [34]

In physics, there is a rule that the heat always travels from the hotter object to the cooler object. In this case, as the iron is hotter than the shirt, the heat will travel from the iron to the shirt.

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2 years ago

Read 2 more answers

The partial pressure of N2 in a mixture of gases, where the total pressure is 1.50 atm, is 300. torr. What is the mole fraction

makvit [3.9K]

Answer:

The mole fraction of N₂ is 0.26.

Explanation:

The pressure exerted by a particular gas in a mixture is known as its partial pressure. So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:

PT = PA + PB

This relationship is due to the assumption that there are no attractive forces between the gases.

Dalton's partial pressure law can also be expressed in terms of the mole fraction of the gas in the mixture. The mole fraction is a dimensionless quantity that expresses the ratio of the number of moles of a component to the number of moles of all the components present.

So in a mixture of two or more gases, the partial pressure of gas A can be expressed as:

PA = XA * PT

In this case:

PA= PN₂= 300 torr
XA=XN₂= ?
PT= 1.50 atm= 1140 torr (being 1 atm= 760 torr)

Replacing:

300 torr= XN₂*1140 torr

Solving:

$X_{N_{2} } =\frac{300 torr}{1140 torr}$

XN₂= 0.26

<u><em>The mole fraction of N₂ is 0.26.</em></u>

6 0

2 years ago

Which sentence correctly explains the process and conditions needed for sleet to form?

laiz [17]

Answer:Sleet only happens under very specific weather conditions. There must be a layer of air near the ground whose temperature is below freezing, where water turns to ice. Above this layer of freezing air must be a layer of warmer air. As snow falls through the warm air, it melts or partially melts into raindrops.

Explanation:

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3 years ago