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3 years ago

The properties of elements are different than the compound that the elements form. Is this statement True or False

Chemistry

1 answer:

ki77a [65]3 years ago

3 0

Answer:

true

Explanation:

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If you have 1.1 moles of magnesium nitrate then how many grams is that

marysya [2.9K]

Answer: 162.8 grams

Explanation:

Magnesium nitrate has a chemical formula of Mg(NO3)2.

Given that:

Number of moles of Mg(NO3)2 = 1.1 moles

Mass in grams of Mg(NO3)2 = ?

For Molar mass of Mg(NO3)2, use atomic mass of magnesium = 24g, nitrogen = 14g, oxygen = 16g

Mg(NO3)2 = 24g + (14g + 16gx3) x 2

= 24g + (14g + 48g) x 2

= 24g + (62g) x 2

= 24g + 124g

= 148g/mol

Now, apply the formula:

Number of moles = Mass in grams / molar mass

1.1 moles = Mass / 148g/mol

Mass = 1.1 moles x 148g/mol

Mass = 162.8 grams

Thus, there are 162.8 grams of magnesium nitrate.

3 0

3 years ago

A student measures the mass of a 10m^3 block of gold to be 500 kg what is the density of the gold

Anuta_ua [19.1K]

Answer:

d = 50 kg/m³

Explanation:

density = $\frac{mass}{volume}$

mass = 500 kg

volume = 10m³

$\frac{500}{10}$ = 50

d = 50 kg/m³

8 0

3 years ago

How did he know that the nucleus was positively charged?

Harman [31]

'cause alphe-particle which was +ve charge, get repulsion from the atom, so he deducted that.......

8 0

3 years ago

At 1000 K, Kp=19.9 for the reaction Fe2O3(s)+3CO(g)<--->2Fe(s)+3CO2(g) What are the equilibrium partial pressures of CO an

SOVA2 [1]

Answer: The equilibrium concentration of CO is 0.243 atm

Explanation:

We are given:

Initial partial pressure of carbon dioxide = 0.902 atm

As, carbon dioxide is present initially. This means that the reaction is proceeding backwards.

For the given chemical equation:

$Fe_2O_3(s)+3CO(g)\rightleftharpoons 2Fe(s)+3CO_2(g)$

Initial: 0.902

At eqllm: 3x (0.902-3x)

The expression of $K_p$ for above equation follows:

$K_p=\frac{(p_{CO_2})^3}{(p_{CO})^3}$

We are given:

$K_p=19.9$

Putting values in above equation, we get:

$19.9=\frac{(0.902-3x)^3}{(3x)^3}\\\\x=0.0810$

So, equilibrium concentration of CO = 3x = (3 × 0.0810) = 0.243atm[/tex]

Hence, the equilibrium concentration of CO is 0.243 atm

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Which statement describes an ionic bond?

mestny [16]

Answer: the answer is C

Explanation:

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