3 years ago

If it takes 43.32 mL of 0.1 M NaOH to neutralize a 50 mL HCl solution, what is the molarity of HCI?

Chemistry

1 answer:

Strike441 [17]3 years ago

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CORRECT ANSWER GETS BRAINEST!!! Which element is in Group 6, Period 4? (Look at image)

vaieri [72.5K]

Answer:

Explanation:

Se is in geoup 6, period 4

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3 years ago

Read 2 more answers

A scientist thinks she has discovered a new element. She took some samples to her colleagues and they performed some tests. Here

nirvana33 [79]

Answer:

Proton number of the supposed discovery debunked the theory.

Explanation:

Proton number of an element is also its atomic number.

For the element in question to have had a proton number that wasn't 119, it could not have been a new element.

Furthermore, the characteristics described (proton number especially) describe exactly the Germanium element.

I believe this was helpful.

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3 years ago

How many moles of water molecules are found in 3.80 moles of zinc(ii) sulfate heptahydrate?

Sindrei [870]

Zinc (ii) sulfate heptahydrate has a formula of ZnSO4.7H2O
Therefore, note that one mole of ZnSO4.7H2O, contains 7 moles of H2O,
Hence, 3.8 moles of ZnSO4.7H2O will contain;
3.8 × 7/1
= 26.6 moles of H2O

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4 years ago

State two differences between an element and a compound.

Umnica [9.8K]

Answer:

See the picture... I hope that's the answer

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3 years ago

A pure radioactive substance has a mass of 30 micrograms but had a mass of 240 micrograms 48 years ago. Assuming that the only c

defon

Answer: Half-life of the substance is 16 years.

Explanation:

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant

t = age of sample = 48 years

a = initial amount of the reactant = 240 micrograms

a - x = amount left after decay process = 30 microgarms

$48=\frac{2.303}{k}\log\frac{240}{30}$

$k=\frac{2.303}{48}\log\frac{240}{30}$

$k=0.0433years^{-1}$

b) $t_{\frac{1}{2}}$ of reaction

$t_{\frac{1}{2}}=\frac{0.693}{k}=\frac{0.693}{0.0433}=16years$

Thus half-life of the substance is 16 years.

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3 years ago