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3 years ago

Why do organisms need nitrogen?

Chemistry

1 answer:

RSB [31]3 years ago

6 0

All bulbs/plants and creatures want nitrogen to produce amino hallucinogen, proteid and DNA, although this nitrogen in the air is not in a manner that everybody can use.

For more information, look at the appendage below!

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Hydrogen and chlorine atoms react to form a simple diatomic molecule in a 1:1 ration, that is HCl. The percent isotopic abundanc

Sergio [31]

Answer:

Four different HCl molecules are possible.

Mass of $^{2}H^{35}Cl$ = 37 amu
Mass of $^{3}H^{35}Cl$ = 38 amu
Mass of $^{2}H^{37}Cl$ = 39 amu
Mass of $^{3}H^{37}Cl$ = 40 amu

Explanation:

Mass of 2-H isotope = 2 amu

Mass of 3-H isotope = 3 amu

Mass of 35-Cl isotope = 35 amu

Mass of 37-Cl isotope = 37 amu

Different HCl molecules possible are:

1) $^2H+^{35}Cl\rightarrow ^{2}H^{35}Cl$

Mass of $^{2}H^{35}Cl$ = 2 amu + 35 amu = 37 amu

2) $^3H+^{35}Cl\rightarrow ^{3}H^{35}Cl$

Mass of $^{3}H^{35}Cl$ = 3 amu + 35 amu = 38 amu

3) $^2H+^{37}Cl\rightarrow ^{2}H^{37}Cl$

Mass of $^{2}H^{37}Cl$ = 2 amu + 37 amu = 39 amu

4) $^3H+^{37}Cl\rightarrow ^{3}H^{37}Cl$

Mass of $^{3}H^{37}Cl$ = 3 amu + 37 amu = 40 amu

6 0

2 years ago

You are using a beaker to measure volume. the beakers graduation begin at 20ml and in indicate every 10ml up to 80 ml. the botto

dolphi86 [110]

Answer:

b) 47ml

Explanation:

The beaker would look like this:

60 mL

50 mL

------- The bottom of the meniscus is here

40 mL

30 mL

So we have between 40 and 50 mL. There are 10 mL of "distance" between those two values, and three fourths of that difference is (10 * 3/4) 7.5 mL.

So the volume is 47.5 mL, but because the measurement instrument (the beaker) does not handle decimals, the value we should report is 47 mL.

6 0

3 years ago

A hydrocarbon is a compound that contains mostly carbon and hydrogen. Calculate the percent composition (by mass) of the followi

Shalnov [3]

Answer: The percentages of carbon and hydrogen numerically to four significant figures is $83.33\%$ and $16.67\%$ respectively.

Explanation:

Molar mass of the compound is the mass of 1 mole of compound which is the sum of masses of each element.

Mass of 1 mole of compound= mass of carbon + mass of hydrogen+ = 5(12) + 12(1)= 72 g.

a) Percentage by mass of carbon = $\frac{\text {mass of carbon}}{\text {Total mass}}\times 100\ %$

Percentage by mass of carbon = $\frac{60}{72}\times 100\%=83.33\%$

b) Percentage by mass of hydrogen = $\frac{\text {mass of hydrogen}}{\text {Total mass}}\times 100\ %$

Percentage by mass of hydrogen = $\frac{12}{72}\times 100\%=16.67\%$

5 0

2 years ago

How many Na ions are in 2.7 g of NaCl? Answer in units of ions.

Viefleur [7K]

Answer:

$2.778 * 10^{22}$

Explanation:

Weight of NaCl is equal to sum of weight of one mole of sodium and one mole of chloride.

Mathematically, it can be represented as -

1 mol (Na) $+$ 1 mol (Cl) $= 23.0 + 35.5 = 58.5$ g/mol

In $58.5$ gram of NaCl, there is one mole of Na or $6.02 * 10^{23}$ ions

In one gram of NaCl, there will be

$\frac{6.02 * 10^{23}}{58.5}$ sodium ions

In $2.7$ grams of NaCl, the number of sodium ions will be -

$\frac{6.02 * 10^{23}}{58.5} * 2.7$

$2.778 * 10^{22}$

3 0

3 years ago

Which of the following lists the elements in order of increasing malleability

dimulka [17.4K]

a...if you had the fully extended periodic table, these elements would be between La and Hf in period 6 and Ac and Rf in period 7

3 0

2 years ago

Read 2 more answers