2 years ago

Plz help give me all the answers to these

Chemistry

1 answer:

Gnoma [55]2 years ago

4 0

16)position
17)starting point
19)balanced, are different, balanced, unbalanced

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How many moles of H2O will be formed from the reaction of 80 g of

Roman55 [17]

Answer: 2 moles of $H_2O$ will be formed.

Explanation:

To calculate the moles :

$\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}$

$\text{Moles of} NaOH=\frac{80g}{40g/mol}=2moles$

The balanced chemical equation is:

$H_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O$

According to stoichiometry :

2 moles of $NaOH$ give = 2 moles of $H_2O$

Thus 2 moles of $NaOH$ give = $\frac{2}{2}\times 2=2moles$ of $H_2O$

Thus 2 moles of $H_2O$ will be formed.

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2 years ago

Q 3.6: calculate the number of po43- ions present in 23.7 g of ca3(po4)2.

malfutka [58]

Moles of ca3(po4)2 = 23.7 / 310.17 = 0.076

moles of (PO4)3- = 0.076 x 2 = 0.152

now, no. of ions = 0.152 x 6.022 x 10^{23}

= 9.2 x 10^{22}

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2 years ago

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How many moles are equal to 7.62 x 1025 molecules lithium hydroxide

ycow [4]

No of moles:-

$\\ \tt\longmapsto \dfrac{No\:of\:atoms}{Avagadro's\; number}$

$\\ \tt\longmapsto \dfrac{7.62(10^{25})}{6.022(10^{23})}$

$\\ \tt\longmapsto 126.5mol$

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In solids, the particles of matter are not in constant motion.

Vsevolod [243]

True because in a solid particles dont move so it wouldn't be in a constant motion.

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How do you know when a phase change happens?

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Answer:

phase for what?

Explanation:

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