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3 years ago

The two factors that cause technology to progress

1 answer:

8 0

Research and new advancements in discoveries like fingerprint unlock for phones.And 3d printers.They were made by researching and discovering new things.

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A 1.000 g sample of an unknown hydrate of cobalt chloride is gently dehydrated. The resulting mass is 0.546 g. The cobalt is iso

ira [324]

Answer:

Explanation:

From the 1 g sample you have:

0.546 grams of cobalt chloride

1-0.546=0.454 grams of water

Now:

1) The salt

Of the 0.546 g, 0.248 g are cobalt (Mr=58.9) and the rest id Cl (Mr=35.45):

$n_{Co}=\frac{0.248 g}{58.9 g/mol}=4.21*10^{-3}mol$

$n_{Cl}=\frac{0.298 g}{35.45g/mol}=8.4*10^{-3}mol$

Dividing:

$\frac{n_{Cl}}{n_{Co}}=\frac{8.4*10^{-3}mol}{4.21*10^{-3}mol}=2$

So the molecular formula will be:

$CoCl_2$

2) The water

The water's molecular weight is M=18 :

$n_{w}=\frac{0.454g}{18g/mol}=0.025 mol$

Bonding with the Co:

$\frac{n_{w}}{n_{Co}}=\frac{0.025mol}{4.21*10^{-3}mol}=6$

The complete formula of the hydrate:

$CoCl_2*6 H_2O$

8 0

4 years ago

ANSWER THIS FOR 15 POINTS!!!

Llana [10]

Answer:

it is the last one

Explanation:

cause over time the meatl will imit heat and heat up the air around it as it cools down slowly

3 0

3 years ago

NEED MAJOR HELP ASAP WHOEVER GETS IT RIGHT FIRST WILL GET BRAINLIEST! PLEASE HELP!!!!!

horsena [70]

i believe its sulfate.

hope i could help

7 0

3 years ago

Read 2 more answers

What evidence have u collected to explain the relationship between the Moon's revolution and lunar phrase?

Assoli18 [71]

Answer:

A lunar eclipse can only happen during a full moon.

Hope I helped :)

Explanation:

3 0

3 years ago

The sodium isotope with 13 neutrons. Express your answer as an isotope

wariber [46]

Answer:

$\large\boxed{\large\boxed{^{24}_{11}Na}}$

Explanation:

The question is asking to write the <em>isotopic symbol </em>of the form $^A_ZX$ for the <em>sodium isotope with 13 neutrons</em>.

In general, the isotopic symbol in the given form shows:

The element's chemical symbol: X

A: mass number of the isotope, written as a superscript to the left of the element's simbol, and

A = number of protons + number of neutrons

Z: atomic number of the isotope, written as a subscript to the left of the elements's symbol,

Z = number of protons

The atomic symbol of sodium is Na.

The atomic number, or number of protons, is the same for every isotope of the element, and you can find it in any periodic table. Tha atomic number of sodium is 11. Thus:

Z = 11

The mass number is the number of protons plus neutrons, hence:

A = 11 + 13 = 24

Now you can write the isotope symbol for the sodium isotope with 13 neutrons:

$^{24}_{11}Na$

6 0

4 years ago