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3 years ago

PLEASE HELP ASAP !!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Chemistry

1 answer:

In-s [12.5K]3 years ago

5 0

+2, because the element has more protons than electrons now

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chemist in South America claims to have discovered a new element with an atomic number of 34. An extremely rare element, it was

Tasya [4]

Answer:

the element he has discovered is called Selenium.

Explanation:

Selenium has an atomic number of 34

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3 years ago

NiSe2 + Ca3(PO4)2 = Ni3(PO4)2 + CaSe balance please

Aliun [14]

3Ni + Sn3(PO4)2 → Ni3(PO4)2 + 3Sn I think. Not for sure though

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2 years ago

How many liters of hydrogen (at 0.97atm and 24c) will produce 180 grams of water

slava [35]

H₂ + ½O₂ → H₂O

2g → 18g

So, 18g water needs 2g H₂

So, 1g water needs 2/18g H₂

So, 180g water needs 2/18 x 180g H₂

→ 20 litres of H₂

6 0

2 years ago

Read 2 more answers

If 5 mol of oxygen gas effuses through an opening in 10 seconds, how long will it take for the same amount of hydrogen gas to ef

andrezito [222]

Answer:

Explanation:

Recall the law of effusion:

$\displaystyle \frac{r_1}{r_2} = \sqrt{ \frac{\mathcal{M}_2}{\mathcal{M}_1} }$

Because 5 mol of oxygen was effused in 10 seconds, the rate is 0.5 mol/s.

Let the rate of oxygen be r₁ and the rate of hydrogen be r₂.

The molecular weight of oxygen gas is 32.00 g/mol and the molecular weight of hydrogen gas is 2.02 g/mol.

Substitute and solve for r₂:

$\displaystyle \begin{aligned} \frac{(0.5\text{ mol/s})}{r_2} & = \sqrt{\frac{(2.02\text{ g/mol})}{(32.00\text{ g/mol})}} \\ \\ r_2 & = \frac{0.5\text{ mol/s}}{\sqrt{\dfrac{(2.02\text{ g/mol})}{(32.00\text{ g/mol})}}} \\ \\ & = 2.0\text{ mol/s}\end{aligned}$

Because there are 5 moles of hydrogen gas:

$\displaystyle 5.0\text{ mol} \cdot \frac{1\text{ s}}{2.0\text{ mol}} = 2.5\text{ s}$

In conclusion, it will take about 2.5 seconds for the hydrogen gas to effuse.

Check: Because hydrogen gas is lighter than oxygen gas, we expect that hydrogen gas will effuse quicker than oxygen gas.

6 0

2 years ago

What is the geometry name for PF5? Is PF5 polar or non-polar?

KonstantinChe [14]

Geometry name is trigonal bypyramidal

non-polar

3 0

2 years ago