2 years ago

When did the water level in Lake Mead become a concern?

1 answer:

6 0

Answer:

in 1983, Lake Mead had a recorded water level of 1,225 feet above sea level. The closest it's been to that level in modern times was in 2000. Explanation:

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1. What is the empirical formula for a compound containing 63.8% N and 36.2% O?

Fittoniya [83]

$M\ N_2=28g/mol\\
63,8\%--28g\\
100\%--x\\
x=43,89g$

43,89g≈44g
44g == 2x 14g (N) + 1x 16x(O)
M N₂O = 44g

3 0

3 years ago

Which one of these elements is the lightest: 1- oxygen , 2- carbon , 3- nitrogen , 4- neon.

icang [17]

It would be carbon because its relative atomic mass is 12

8 0

3 years ago

Please help and thank you

Assoli18 [71]

Im pretty sure it's d

8 0

3 years ago

What is the mass of NaCl required to make 160 grams of a 12% solution of NaCl in water?

Ksivusya [100]

Answer:

0.5

L solution

⋅

required molarity



2.5 moles NaCl

L solution

1.25 moles NaCl

Now, to convert this to grams of sodium chloride, you must use the mass of

mole of this compound as a conversion factor. The mass of

mole of sodium chloride is given by its molar mass

1.25

moles NaCl

⋅

58.44 g

mole NaCl

73 g

−−−−

Explanation: if this is wrong i am very sorry

6 0

3 years ago

There are three subatomic particles. the particle that is charged positively in the nucleus is called the

Sholpan [36]

It is called a proton I hope this helps

5 0

4 years ago