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2 years ago

What is the empirical formula for butane, C4H10

Chemistry

1 answer:

pochemuha2 years ago

4 0

C2H5 i think by ÷2 on both

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A student walks 3.0 hours and travels 6.0km what is the averge speed

saveliy_v [14]

Answer:

2.0 km/hr

Explanation:

6.0 km/3.0 hrs

= 2.0 km/hr

Hope this helps! :3

plz mark as brainliest!

6 0

2 years ago

5. At 20°C, the water autoionization constant, Kw, is 6.8 ´ 10–15. What is the H3O+ concentration in neutral water at this tempe

rjkz [21]

Explanation:

Let us assume that the concentration of [ $OH^{-}$ and $H^{+}$ is equal to x. Then expression for $K_{w}$ for the given reaction is as follows.

$K_{w} = [OH^{-}][H^{+}]$

$K_{w} = x^{2}$

$6.8 \times 10^{-15} = x^{2}$

Now, we will take square root on both the sides as follows.

$\sqrt{6.8 \times 10^{-15}} = \sqrt{x^{2}}$

$[H^{+}] = 8.2 \times 10^{-8}$ M

Thus, we can conclude that the $H_{3}O^{+}$ concentration in neutral water at this temperature is $8.2 \times 10^{-8}$ M.

8 0

2 years ago

Read 2 more answers

Convert 4.92 L of hydrogen at STP to moles.

Lorico [155]

${\huge{\fcolorbox{yellow}{red}{\orange{\boxed{\boxed{\boxed{\boxed{\underbrace{\overbrace{\mathfrak{\pink{\fcolorbox{green}{blue}{Answer}}}}}}}}}}}}}$

$\sf C) \: 0.220 \: mol \: H_2$

Explanation:

1 mol = 22.4 litres

4.92 = how many moles?

$\sf \implies \frac{4.92}{22.4} \\ \\ \sf \implies 0.2196 \\ \\ \sf \implies 0.220 \: mol \: H_2$

5 0

2 years ago

Read 2 more answers

What would be the mass of 4.56x10²³ water molecules

kifflom [539]

Every time you see molecules, atoms, & particles think of avagadros #. (6.022 x 10^23)

Answer: 13.6 grams of H2O

Solution: (4.56x10^23) x (1 mol H2O/6.022x10^23) x (18 grams H2O/1 mol H2O) = 13.6 grams of H2O

Using dimensional analysis above makes these types of problems easy.

3 0

2 years ago

In preparation for a blizzard, a city dispatches a crew to spread salt on the street surface of the bridges around town. The sal

timofeeve [1]

Solid to liquid because it wil defrost

4 0

3 years ago