3 years ago

PLEASE ANSWER ASAP please get it right

Chemistry

1 answer:

musickatia [10]3 years ago

4 0

Answer: C

Earths atmosphere maintains a stable temp

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What is the percent by mass of magnesium sulfate in MgSO4 · 7H2O?

Degger [83]

Answer: 48.83%

Explanation: Mass percent is the ratio of mass of the particular substance to the total mass of given compound.

${\text {mass percentage}}=\frac{\text{mass of }MgSO_4}{\text {total mass}}\times 100\%$

Mass of $MgSO_4$ = 120g

Mass of $MgSO_4.7H_2O$ = 246g

${\text {mass percentage}}=\frac{120g}{246g}\times 100\%=48.83\%$

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3 years ago

How many moles are in 75.0g of Na2CO3

emmasim [6.3K]

Answer:

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3 years ago

Consider the exothermic reaction

alisha [4.7K]

Answer:

The answer to your question is -2855 J

Explanation:

Reaction

2C₂H₆ + 7O₂ ⇒ 4CO₂ + 6H₂O

Formula

Heat of reaction = ΔHrxn = ΣΔHrxn products - ΣΔHrxn reactants

Substitution

ΔHrxn = { 4(-393.5) + 6(-241.8)} - {2(-84.7) + 7(0)}

ΔHrxn = {-1574 -1450.8} - {-169.4}

ΔHrxn = -3024.8 + 169.4

ΔHrxn = -2855.4 J

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Is tap water a compound, a homogenous mixture, or a heterogeneous mixture?

goldenfox [79]

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4 years ago

Can someone fill out the chart please?

zlopas [31]

Answer:

LOL i don't even know

Explanation:

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