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3 years ago

A student is doing chemistry lab using strong acid and starts eating

Chemistry

1 answer:

Lelu [443]3 years ago

6 0

Anything else to it?

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The mineral magnesite contains magnesium carbonate, MgCO3 (molar mass= 84 g/mol), and other impurities. When a 1.26-g sample of

Leviafan [203]

The answer is 33.33 %

The explanation:

According to the reaction equation:

MgCO3(s) + 2HCl (aq) --> MgCl2(aq) + H20(l) + CO2(g)

we can see that 1 mole of MCO3 will produce → 1 mole of CO2

-Now we need o get number of mole of CO2:

and when we have 0.22 g of CO2, so number of mole = mass / molar mass

moles = 0.22 g / 44 g/mol = 0.005 mole

∴ moles of Mg = moles of CO2 = 0.005 mole

∴ mass of Mg = moles * molar mass

= 0.005 * 84 /mol = 0.42 g

∴ Percent of MgCO3 by mass of Mg = 0.42 g / 1.26 * 100

= 33.33 %

6 0

3 years ago

Read 2 more answers

A forensic chemist is given a white powder for analysis. She dissolves 0.50 g of the substance in 8.0 g of benzene. The solution

Sholpan [36]

Answer:

The given compound cannot be cocaine.

Explanation:

The chemist can comment on the nature of compound being cocaine or not from the depression in freezing point.

Depression in freezing point of is related to molality as:

Depression in freezing point = Kf X molality

Where

Kf = cryoscopic constant = 4.90°C/m

depression in freezing point = normal freezing point - freezing point of solution

depression in freezing point = 5.5-3.9 = 1.6°C

1.6°C = 4.90 X molality

$molality=\frac{1.6}{4.90} = 0.327 m$

we know that:

$molality=\frac{moles}{mass of solvent(kg)}=\frac{moles}{0.008kg}$

therefore

moles = 0.327X0.008 = 0.00261 mol

$moles=\frac{mass}{molarmass}$

$molarmass=\frac{mass}{moles}=\frac{0.50}{0.00261}= 191.57g/mol$

The molar mass of cocaine is 303.353

So the given compound cannot be cocaine.

3 0

3 years ago

PLEASE HELP!!!!!!!

Basile [38]

Answer:

2nd option

Explanation:

5 0

3 years ago

How do you raise the boiling point of a liquid?

Naddika [18.5K]

Raise the boiling temperature

6 0

3 years ago

10. When a piece of steel wool is burned it gains mass. Which explanation is consistent with the law of conservation of mass?

frez [133]

Answer:

Oh come on. Look at all - then look at A.

Explanation:

4 0

3 years ago