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3 years ago

7

What would be the effect on your calculated mas percent recovery of Cu if you did not completely react the Mg in the reaction mi

xture?

1 answer:

Anarel [89]3 years ago

6 0

The mass percentage would be reduced but not as much as if it were a complete reaction ヽ༼ຈل͜ຈ༽ﾉ︵┻━┻ mark brainliest please

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- Write down Rutherford's atomic model with diagram .also write down defects of Rutherford's atomic model. - write down neil boh

anastassius [24]

this is the answer

sorry if the answer is wrong

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3 years ago

the half life of the radioactive element strontium-90 is 29.1 years. If 16 grams of strontium-90 are initially present, how many

8_murik_8 [283]

Answer:

4 g after 58.2 years

0.0156 After 291 years

Explanation:

Given data:

Half-life of strontium-90 = 29.1 years

Initially present: 16g

mass present after 58.2 years =?

Mass present after 291 years =?

Solution:

Formula:

how much mass remains =1/ 2n (original mass) ……… (1)

Where “n” is the number of half lives

to find n

For 58.2 years

n = 58.2 years /29.1 years

n= 2

or 291 years

n = 291 years /29.1 years

n= 10

Put values in equation (1)

Mass after 58.2 years

mass remains =1/ 22 (16g)

mass remains =1/ 4 (16g)

mass remains = 4g

Mass after 58.2 years

mass remains =1/ 210 (16g)

mass remains =1/ 1024 (16g)

mass remains = 0.0156g

8 0

4 years ago

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Steel is an alloy consisting of Fe with a small amount of C. Elemental Cr can be added to steel to make the steel less likely to

Yakvenalex [24]

The statement is true

8 0

3 years ago

An alkali metal is most likely to form an ionic bond with an element from which group?

Alborosie

Answer: the correct answer is B. Hallogens hope this helped mind helping out with making me brainliest?

7 0

3 years ago

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Given the reaction: Ca + 2H2O → Ca(OH)2 + H2 What is the total number of moles of Ca needed to react completely with 4.0 moles o

DiKsa [7]

<u>Answer:</u> The number of moles of calcium metal required is 2.0 moles.

<u>Explanation:</u>

We are given:

Moles of water reacted = 4.0 moles

The given chemical reaction follows:

$Ca+2H_2O\rightarrow Ca(OH)_2+H_2$

By Stoichiometry of the reaction:

2 moles of water is reacted with 1 mole of calcium metal

So, 4.0 moles of water will react with = $\frac{1}{2}\times 4.0=2.0mol$ of calcium metal

Hence, the number of moles of calcium metal required is 2.0 moles.

6 0

3 years ago

Read 2 more answers