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4 years ago

The universe is mostly made up of what?

Chemistry

1 answer:

daser333 [38]4 years ago

6 0

The universe is made mostly of empty space nothing else even close.

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Convert 2.072x10^43 atoms element to moles

tangare [24]

Given :

Number of atoms of an element, n = 2.072 × 10⁴³ atoms.

To Find :

Number of moles of that element in given number of atoms.

Solution :

We know, 1 mole of any element contains 6.022 × 10²³ atoms.

So, number of moles in given number of atoms are :

$n = \dfrac{2.072\times 10^{43}}{6.022\times 10^{23}}\\\\n = 3.441 \times 10^{19}\ moles$

Hence, this is the required solution.

8 0

3 years ago

Which of the following is NOT studied in Earth Science?

xxTIMURxx [149]

Answer:

the answer to your question is B

3 0

3 years ago

Read 2 more answers

Any atom can be considered stable if it has what ?

lora16 [44]

Any atom can be considered stable if it has an equal number of protons and electrons, giving it a net charge of zero. If this balance does not occur that atom is ionized.

8 0

3 years ago

Read 2 more answers

NH4+(aq) + NO2−(aq) → N2(g) + 2H2O(l) is given by rate = k[NH4+][NO2−]. At a certain temperature, the rate constant is 4.10 × 10

arlik [135]

Answer:

$rate = 1.97\times 10^{-5}\ M/s$

Explanation:

Given that:-

$rate = k[NH_4^+][NO_2^-]$

k = $4.10\times 10^{-4}\ /Ms$

$[NH_4^+]=0.301\ M$

$[NO_2^-]=0.160\ M$

So,

$rate = 4.10\times 10^{-4}\times 0.301\times 0.160\ M/s=1.97\times 10^{-5}\ M/s$

<u> $1.97\times 10^{-5}\ M/s$ is the rate of the reaction at that temperature if [NH4+] = 0.301 M and [NO2−] = 0.160 M.</u>

8 0

3 years ago

NEED HELP ASAP WILL GIVE BRAINLIEST

Arlecino [84]

Answer:

2.83

Explanation:

Molar concentration (mol/litre) = mass/molar mass × 1000/volume(in ml)

0.849 = mass/60.09 × 1000/55.5

mass = (0.849 × 60.09 × 55.5)/1000

= 2.8314

To 2 decimal places = 2.83

7 0

2 years ago