3 years ago

The kilogram is the SI unit for mass. (2 points) true or false?

Chemistry

1 answer:

STALIN [3.7K]3 years ago

8 0

Answer:

True

Explanation:

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What does NO5 stand for?

nekit [7.7K]

1- Nitrogen 5- Oxygen maybe, i can't find it on the periodic table

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3 years ago

What is the concentration of the solution prepared by dissolving 2.35 g of KBr (M = 119 g/mol) in 250 mL of water?

dusya [7]

Answer:

The concentration of KBr is $C = 0.07899 \ mol L^{-1}$

Explanation:

From the question we are told that

The mass of KBr is $m_{KBr} = 2.35 \ g$

The molar mass of KBr is $M_{KBr} = 119 g/mol$

Volume of water is $V = 250 \ mL = 250 *10^{-3} = 0.250 \ L$

This implies that the volume of the solution is $V = 250 mL$

The number of moles of KBr is

$n = \frac{m_{KBr}}{M_{KBr}}$

Substituting values

$n = \frac{2.35}{119}$

$n = 0.01975 \ mol$

The concentration of KBr is mathematically represented as

$C = \frac{0.01975}{0.250}$

$C = 0.07899 \ mol L^{-1}$

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3 years ago

The amount of matter in a given amount of volume is referred to as

Damm [24]

Answer:

It would be Density because:

Density= mass/ volume

Density refers to the amount of matter or mass of a substance over a volume

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2 years ago

Which object forms when a supergiant explodes

klasskru [66]

black hole

hope it helps

edit: neutron star

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3 years ago

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Lostsunrise [7]

Answer:

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Explanation:

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2 years ago