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3 years ago

What is the universe made of?

Chemistry

2 answers:

brilliants [131]3 years ago

7 0

Methane, nitrogen, dark matter, and radiation.

Marrrta [24]3 years ago

4 0

The universe is thought to be made 3 things: normal matter, dark matter, and dark energy.

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Q2. 0.254 g of KHP (204 g/mol) titrated against 20.0 mL of unknown NaOH (40.0 g/mol) solution to get the end point of phenolpht

Vera_Pavlovna [14]

Answer:

Mass concentration (g/L) = 2.49g/L.

Explanation:

No. of moles = $\frac{mass}{molar mass}$

= $\frac{0.254}{204}$ = 0.001245 moles

Concentration of KHP (C1) in litres = n/v

= $\frac{0.001245}{0.02}$ = 0.062 mol/L

We know that:

$C_{1} V_{1}$ = $C_{2} V_{2}$

where c1v1 and c2v2 are the products of concentration and volumes of KHP and NaOH respectively.

Since mole ratio is 1 : 1.

1 mole of NaOH - 40g

0.001245 mole of NaOH = 40 × 0.001245 = 0.0498g

⇒0.0498g of NaOH was used during the titration

∴Mass concentration (g/L) = 0.0498g ÷ 0.02L

= 2.49g/L.

3 0

3 years ago

100.mL of a .795 M solution of KBr is diluted to 500.mL. what is the new concentration of the solution?

kap26 [50]

Answer:

0.159 M

Explanation:

convert from mL to L then use the equation:

M1V1 = M2V2

rearrange to find M2

$\frac{M1V1}{V2} = M2$

$\frac{(0.795 M)(0.100 L)}{0.500 L} = 0.159 M$

4 0

3 years ago

Can someone answer all please.

boyakko [2]

Answer:

poszukaj w necie , proszę a nie prosisz innych o gotowca

8 0

3 years ago

What is the correct formula for tin(II) chloride dihydrate?

seropon [69]

the answer is A. SnCl2 . 2H2O

3 0

2 years ago

What does evaporation produce?

baherus [9]

Answer:

C. Water Vapor

Explanation:

Hope this helps! Have an Amazing day!!

7 0

2 years ago

Read 2 more answers