10/25/17

Can you help me with this enthalpy problem?
Consider the reaction: 2H2+O2==>2H2O (change in enthalpy -572J)   A. How much heat is evolved for the production of 1.00 mol H2O?   B. How much heat is evolved when 186g O2 is reacted with... more
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10/25/17

What is the measured optical rotation of a (s) and (r) bromobutane mixture
If a solution of 10.0 g of (S)-2-bromobutane in 100 mL of hexane gives an observed rotation of +2.31, then what would be the measured optical rotation of a solution that contains 7.5 g of... more
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10/25/17

A female Asian elephant might weigh up to 4,160 kg. How many micrograms is this?
use the correct number of significant figures and show all work
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10/25/17

The biggest bubble ever blown, according to the Guinness Book of World Records, was 55.9 cm diameter What would this be in hm?
show all work and use the correct numbers of significant figures
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10/25/17

The speed limit on a high way is 95 𝑘𝑚/ℎ𝑟 what would this speed be in 𝑚/𝑠 ? (HINT: show conversion for hours to minutes and minutes to seconds)
show all work and use the correct numbers of significant figures
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10/25/17

The total air that your lungs can hold is approximately 6,000. cm3 . What would this volume be in m3 ?
show all work and use the correct numbers of significant figures
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10/25/17

i need help with these for my chem class
1.)how many atoms of nickel are there in 40.08 moles ni2.)how many moles of argon are there in 9.80 x 10^25 atoms3.)How many moles of LIF are there in 60.09g?4.)how many grams are there in 0.3606... more
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10/25/17

A rectangular object weighs 2445 g and its density is 12.9 g/cm3. When measured, its height is 7.43 cm and its width is 3.45 cm. How long is the object?
density = mass/volume
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10/25/17

in biology, when a bacteria finds it self on a hypertonic solution of sugar what happens
in biology, when a bacteria finds it self on a hypertonic solution of sugar what happens
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10/25/17

The wavelength of red light is approximately 750 nm. How many meters would this be? 18. The total air that your lungs can hold is approximately 6,000. cm3 . Wh
use the correct numbers of significant figures
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10/24/17

Which one would elute first from the column chromatography that has a stationary phase and a weak polar solvent?Explain your answer.
Which one would elute first from the column chromatography that has a stationary phase and a weak polar solvent?Explain your answer.   A)Hexane B)Hexan-1-ol C)Hexene D)Hexan-1-one
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10/24/17

Why are troponin and creatine kinase used to diagnose a heart attack?
Why are Troponin and Creatine Kinase often used as cardiac blood markers to diagnose a myocardial infarction (heart attack). Also, could these be used to evaluate if smooth muscle of the GI tract... more
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10/24/17

For the reaction, calculate how many moles
For the reaction, calculate how many moles of the product form when 2.57 mol of Na completely reacts. Assume that there is more than enough of the other reactant.2Na(s)+O2(g)→Na2O2(s)
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10/24/17

10g of Sb2S3 reacts with 7.3g of HCl. how much of the reactant in excess is left at the end?
Ive worked out the limiting reactant which is Sb2S3. Ive calculated moles of Sb2S3. Do I multiply moles of Sb2S3 by 6 to get moles of HCl used? How do you work the mass in excess from... more
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10/24/17

Setting up a math problem
The average adult heart pumps aboutof blood at 84.0 mL/s of blood at 72beats per minute. Suppose you need to calculate how long it would take the average heart to circulate 6500.0 mLof blood.Set... more
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10/23/17

Can you help me with this problem on enthalpy
For the reaction 4Fe+3O2==>2FeO3 (change in enthalpy=-1652)   A. How much heat is released when 4.00 mol iron is reacted with excess O2?   B. How much heat is released when 1.00 mol Fe2O3 is... more
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10/23/17

Methane has the formula CH4. For the combustion of 237 g of methane we produce 802.3 KJ of heat energy
how much heat do we produce? write and balance the equation classify the reaction type and endo/exothermic what does enthalpy indicate write the balanced equation showing energy as a... more
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10/23/17

Given 63.1 g of hydrochloric acid and 17.2 g of oxygen products are water and 49.3 g of chlorine
write and balance the equation determine the limiting reactant determine theoretical yield and percent yield
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10/23/17

Write and balance the equation for the formula of aluminum oxide from its elemental composition.
also, determine the limiting reactant give 1.0 g of aluminum and 1.0 g of oxygen
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10/23/17

Aluminum nitrate solubility
Solubility rules
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10/23/17

What volume of iron (density 7.87 g/cm3) would be required to balance a 1.00 cm3 sample of lead (density 11.4 g/cm3) on a two-pan laboratory balance?
What volume of iron (density 7.87 g/cm3) would be required to balance a 1.00 cm3 sample of lead (density 11.4 g/cm3) on a two-pan laboratory balance?
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10/23/17

How many ml of 0.1 M HCl would be required to titrate 35 ml of 1 M NaOH to the end point?
I need help answering this question for chemistry. Please show your work. Thank you.
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10/23/17

Data Table 4: Reaction of Rocks with Hydrochloric Acid
This is from a lab about acid rain
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10/23/17

A cylindrical aluminum can contains 330ml of cola, if the can's diameter is 6cm what is the can's height?
A cylindrical aluminium can contain 330ml of cola, if the can's diameter is 6cm what is the can's height? & if the can height was 10cm what is it's diameter?
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10/23/17

What steps do I need to use to solve this gas thermochemistry problem?
A sample of an ideal gas at 15.0 atm and 10.0L is allowed to expand against a constant external pressure of 2.00atm at a constant temperature. Calculate the work in units of kJ for the gas expansion
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