3 years ago

______is used in production of hard disk. 1 platinum 2 silver 3 gold

Chemistry

1 answer:

julia-pushkina [17]3 years ago

6 0

Answer:

platinum

Explanation:

the film on a hard drive platter contains platinum

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the applied force is greater than the force of friction

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3 years ago

How many valence electrons are lost by Sr when forming SrI2?

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The production of ammonia (NH3) under standard conditions at 25°C is represented by the following thermochemical equation. N2(g)

asambeis [7]

Answer:

44,901 kilo Joule heat is released when $1.663\times 10^4 g$ grams of ammonia is produced.

Explanation:

Moles of ammonia gas produced :

$\frac{1.663\times 10^4 g}{17 g/mol}=978.235 mol$

According to reaction, when 2 moles of ammonia are produced 9.18 kilo joules of energy is also released.

So, When 978.235 moles of ammonia gas is produced the energy released will be:

$\frac{-91.8 kJ}{2}\times 978.235 mol=-44,900.98 kJ\approx -44,901 kJ$

(negative sign indicates that energy is released as heat)

44,901 kilo Joule heat is released when $1.663\times 10^4 g$ grams of ammonia is produced.

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3 years ago

One way to determine the empirical formula of a compound involves using the percent composition of the compound.

iragen [17]

True! You can use the percentage to determine the amount of moles of each substance in the compound, and then use that information to find the empirical formula.

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4 years ago

Which of the following are covalent compounds? Select all that apply.<br> CaO<br> CO2<br> KBr<br> NO

Sergeeva-Olga [200]

Answer

CO2 and NO are covalent

Explanation:

Which of the following are covalent compounds? Select all that apply.

CaO

CO2

KBr

the atoms ib covalent compounds share electron pairsO

CaO and KBr are ioinic

CO2 and NO are covalent

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3 years ago