Thursday

April 24, 2014

April 24, 2014

Number of results: 3,403

**Physics Sig Figs**

When you are multiplying two numbers, how do you determine the number of significant figures? You go with the lowest sig figs in your problem. so suppose you multiply 2.34 and 8.9574, in your product you should have 3 sig figs as the lowest sig fig in your problem is 2.34 ...
*Saturday, August 27, 2005 at 9:28pm by Meleas*

**How many sig figs?**

For this question: what is the boiling point of 0.39 mol ethylene glycol and 0.13 mol KBr in 155 g H2O? I got 102.1470968 and I tried it with 2 and with 3 sig figs but it's both wrong. I know that's the correct answer but I don't know how many sig figs I'm suppose to use
*Thursday, March 24, 2011 at 9:23pm by Hannah*

**sig figs**

I am having trouble with my sig figs Many scientific data are reported at 25°C. What is this temperature in kelvins and in degrees Fahrenheit? I got 3.0e2 degrees kelvin since it will have to have two sig figs but it said it was wrong
*Wednesday, August 15, 2012 at 6:01pm by Hannah*

**How many sig figs?**

An equilibrium mixture of the following reaction was found to have [H2] = 0.020 M and [I2] = 0.020 M at 340°C. What is the concentration of HI? H2(g) + I2(g)--> 2 HI(g) Keq = 69 at 340°C I got .166 but it said check number of sig figs so im guessing its 2 sig figs but I ...
*Sunday, April 17, 2011 at 1:13pm by Rachel*

**chemistry**

for a manometer flask diagram, if ha = 134 mm, how do I convert to torr, Pa, and atm with the right amount of sig figs? Related to sig figs, how do I get the right amount of sig figs (which is 2) with 8339?
*Monday, October 29, 2007 at 4:56pm by Avonlea*

**sig figs**

how do you round 0.009934 to two sig figs? would it be .010? or would that be 3 sig figs?
*Sunday, August 22, 2010 at 3:41pm by Rebekah*

**SIG FIGS**

How many significant figures does 22.0, 0.22, 22. , 0.022? Im just confused as to the decimal addition to numbers and what the sig figs will be for them. If you dont mind can you please state some rules for sig figs that are helpful and some confusing rules as well and pretty ...
*Thursday, September 20, 2012 at 10:34pm by Sally*

**Chemisty (Sig Figs)**

1.20 Mm to kilometers its 1200 but when I put it in it said not the correct number of sig figs
*Wednesday, August 25, 2010 at 8:34pm by Rebekah*

**Math**

What is the difference between the measured values of 1.05m and 1.050m? What factor of a measurement tool determines the sig figs of a measured value? The two values are different because of their sig figs, the first has 3 and the other has 4. I think that the factor of a ...
*Monday, September 3, 2012 at 3:06pm by Hannah*

**Physics(Please check)**

What is the difference between the measured values of 1.05m and 1.050m? What factor of a measurement tool determines the sig figs of a measured value? The two values are different because of their sig figs, the first has 3 and the other has 4. I think that the factor of a ...
*Sunday, September 2, 2012 at 3:22pm by Hannah*

**Physics(Please check)**

What is the difference between the measured values of 1.05m and 1.050m? What factor of a measurement tool determines the sig figs of a measured value? The two values are different because of their sig figs, the first has 3 and the other has 4. I think that the factor of a ...
*Monday, September 3, 2012 at 2:26am by Hannah*

**chem**

do this using the appropriate number of sig figs 320.44 − (3104.1/2.6) i got -880 as my answer and it said to check my sig figs. I thought it was all the numbers up to the ones place
*Saturday, August 18, 2012 at 3:56pm by Hannah*

**sig figs**

each of the following were suppose to be rounded to two sig figs. mark then correct or incorrect. if incorrect state the correct answer 1) 1.249 103 to 1.3 103 i know its wrong but i don't know the correct answer 2)7.999 102 to 80 its wrong and i thought it was 800. but they ...
*Monday, August 23, 2010 at 5:22pm by Sara p.*

**Chemisty (Sig Figs)**

this is my last question for the whole assigment and im soo glad!!! (9465 + 45 - 9.9) 8.1 X 10^6 i got 76950.e6 it said it was half right and said check your number of sig figs
*Monday, August 23, 2010 at 8:09pm by Hannah*

**Chemisty (Sig Figs)**

Each of the following numbers was supposed to be rounded to two significant figures. For each one below, decide whether it was correctly rounded or not, and for those that were incorrectly rounded, correct them. (a) 3.149 e3 to 3.2 e3 Its incorrect but I dont know the correct ...
*Monday, August 23, 2010 at 4:34pm by Hannah*

**chemistry**

1) Starting with 75.00 g of 1-propanol and 75.00 g of PCl 3. Calculate the theoretical yield of 1-chloropropane. 3CH3CH2CH2OH + PCl 3 --> 3CH3CH2CH2Cl + H3PO3 Answer in terms of grams. the answer that i got is 98.12, is this right and how many sig figs should it be? 2) What...
*Saturday, October 1, 2011 at 7:10pm by anonymous*

**Beginning Chemistry**

I am really confused weith sig. figs. and it would really help if someone could check my answers. My answers are after each problem Determine the number of sig. figs. in the following (a)12.7040g - 6 (b)200.0 cm - 4 (c)276.2 tons - 4 (e)4.00 x 10^3 - 3 (f)100 degrees C - 1
*Thursday, September 20, 2007 at 10:01pm by Sadie*

**Physics**

I'm confused about significant digits in multi-step problems. If I have something like (7.004 +0.2230)/(15.1-0.033+12.07) do I first do the addition and round to 4 sig figs and then do the denominator and round to 2 sig figs and finally divide? Or do I just work everything out...
*Monday, February 9, 2009 at 10:07pm by Katie*

**Chemistry - check answers**

Can someone please check my answers and make sure they're correct? A) How much heat would it take to raise the temperature of 46.0 g of water from 90.0 to 100.0 C? Answer using correct sig figs, sign, and units. My answer: +1.92x10^3 J B) How many joules are released when 84.0...
*Sunday, February 23, 2014 at 10:53am by Amanda*

**SIGS FIGS **

WHAT ARE SIG FIGS
*Friday, September 16, 2011 at 1:35am by David*

**Chemistry Check**

A thermocouple was calibrated to give Celsius temperature. In the ice bath the voltage reading was 0.250 V, and in boiling water at 736 Torr the reading was 1.20 V. Derive the conversion equation between Volts and temp. C. So if I'm working this right, it should go like this: ...
*Monday, September 24, 2012 at 12:18am by Sarah*

**trig/sig figs**

There are 60" in 1', 60' in 1°, and 2π radians in 360°. Convert arc-seconds into radians. KEep 6 significant figures. If someone could help and walk me through this process, it would be soooo appreciated!
*Thursday, January 17, 2013 at 9:05pm by carl*

**Sig Figs**

In a 9V circuit, all the resistors are 20 or 40 kilo Ohms. Convention says that calcs should therefore be quoted to 1 sig fig, since the volts are the least accuracy. 2 seems better though. Any ideas?
*Sunday, February 22, 2009 at 3:34pm by charlie*

**Propagation of error and sig. figs**

I'm really embarrassed to ask this! I knew how to do it before but I forgot after 2 years. I remember learning it for analytical chemistry :( So a basic problem: What is x= a+b+c? given that: a= 100.7 +/- 0.05 b= 0.61 +/- 0.005 c=226 +/- 0.5 OK. My question is the following: I...
*Friday, January 22, 2010 at 12:03am by Steven*

**math**

See below PLEASE at ******** If computing N(t) = Pa^t where P=642.035376 and a = 2.900129566 (both are stored in calculator), to what extent should the values of N(5), N(7) and N(9) be rounded? and why? Note: N(5)= 131,718 N(7)= 1,107,849 N(9)= 9,317,847 algebra - bobpursley, ...
*Sunday, November 6, 2011 at 4:49pm by another sig figs ques Please answer*

**algebra**

SEE BELOW PLEASE at******** If computing N(t) = Pa^t where P=642.035376 and a = 2.900129566 (both are stored in calculator), to what extent should the values of N(5), N(7) and N(9) be rounded? and why? Note: N(5)= 131,718 N(7)= 1,107,849 N(9)= 9,317,847 algebra - bobpursley, ...
*Sunday, November 6, 2011 at 3:29pm by sig figs ques 2*

**algebra**

SEE BELOW PLEASE at******** If computing N(t) = Pa^t where P=642.035376 and a = 2.900129566 (both are stored in calculator), to what extent should the values of N(5), N(7) and N(9) be rounded? and why? Note: N(5)= 131,718 N(7)= 1,107,849 N(9)= 9,317,847 algebra - bobpursley, ...
*Sunday, November 6, 2011 at 3:29pm by sig figs ques 2*

**chem**

why are sig. figs important?
*Tuesday, December 16, 2008 at 1:17am by Natash*

**science**

How do I multiply using sig figs?
*Monday, October 22, 2007 at 7:22pm by Griffin*

**MATHS**

what is 0.0113 to 2 sig figs please
*Tuesday, May 5, 2009 at 6:12pm by mathew -b*

**Math**

How many sig figs does tan^-1(9/7) have?
*Tuesday, August 24, 2010 at 8:45pm by jim*

**chemistry**

how many sig figs in this number: 32.6721
*Friday, September 13, 2013 at 12:34am by Muhammad*

**chem sig figs**

How many significant figures are in 0.0? And how about 0.00?
*Saturday, February 25, 2012 at 2:39pm by L.Bianchessi*

**beginning chemistry**

The problem says indicate the the number of sig. figs. that should be present in the answers to the following problem without solving the problem. 0.70 x 7.00 x 6.880= What is a sig.fig. and how can you find them without solving the problem? It doesn't make sense
*Wednesday, September 19, 2007 at 2:58pm by Kimmi*

**Chemistry**

This should be easy... What would 61.98 be to three sig figs?? 62.0 or 61.9??
*Wednesday, October 22, 2008 at 11:31am by Laur*

**Chemisty (Sig Figs)**

79.7 + 890.43 - 23 = 9.5 e2 its wrong and I am suppose to correct it.
*Monday, August 23, 2010 at 7:06pm by Hannah*

**Physics**

how many sig figs do you use for estimated absolute uncertainties?
*Monday, November 29, 2010 at 11:40pm by Emily*

**chemistry**

(3.84 x 103 x 0.764) + 1.59 answer with the correct sig figs
*Tuesday, January 31, 2012 at 7:00pm by k*

**chemistry**

(2.60 x 10^3 x 0.897) + 2.69 (with correct # of sig figs) IS the answer 2334.89
*Tuesday, January 31, 2012 at 7:42pm by kr*

**significant figures**

(42.70 + 0.259) / 28.4 I wanted to know, if it 1.510 or 1.51? because it has to be correct sig figs.
*Tuesday, September 2, 2008 at 10:14pm by soojung*

**significant figures**

how do i make 1020 to 2 sig figs? it cant round to 1100..
*Tuesday, December 2, 2008 at 10:51pm by s*

**Chemistry**

Round this to two sig figs: 4025000 Is the correct answer 4.0 x 10^6?
*Wednesday, September 26, 2012 at 8:48pm by Anonymous*

**Chemistry**

Hi I need help with sig figs with this problem (0.6216+0.0871)/(0.0740+0.0335)
*Thursday, May 6, 2010 at 9:57am by Anonymous*

**chemistry**

your in seam is 35.0 in.how many cm is this?show your final answer with units and correct sig figs.
*Wednesday, September 5, 2012 at 10:59pm by Anonymous*

**science**

What are the rules for number of sig figs in the answer when multiplying/dividing? when adding /subtracting?
*Monday, November 29, 2010 at 10:05pm by anonymous*

**math**

sig figs for.. 1.399 x by 10-3 0.0763 m2 212.080 g 673.133 K 6.69808e+06 cm
*Sunday, October 2, 2011 at 6:22pm by becca*

**sig figs**

70.74074074 ^ 1/4 = a 2.900129566 = a Now I have to round to 3 significant digits. Is it 2.90 or 2.9001?
*Sunday, November 6, 2011 at 2:14pm by help please*

**physics**

Velocity and displacement with uniform acceleration: 1. A car with an initial speed of 23.7 km/h accelerates at a uniform rate of 0.92 m/s^2 for 3.6 s. Find the final speed and the displacement of the car during this time. The final speed is 36 km/h. is this right? did i do ...
*Monday, September 25, 2006 at 8:10pm by anonymous*

**Physics**

Calculate the power output of a 1.5 fly as it walks straight up a windowpane at 2.2 P=__W (2 sig figs)
*Wednesday, July 14, 2010 at 4:46pm by Brittany*

**Physics**

Calculate the power output of a 1.5 fly as it walks straight up a windowpane at 2.2 2 sig figs P= ___W
*Wednesday, July 14, 2010 at 4:48pm by Brittany*

**conversion problems**

150. cm to millimeters i got it to 1500mm. but it said check the number of sig figs.
*Tuesday, August 24, 2010 at 4:11pm by Hannah*

**Chemistry**

(2.50mL)(0.10M) / 75.00mL = 0.003333 Im not sure how many sig figs to use. Would it 3.33e-3?
*Sunday, February 26, 2012 at 8:40pm by Hannah*

**Math**

How many significant figures does 22.0, 0.22, 22. , 0.022? Im just confused as to the decimal addition to numbers and what the sig figs will be for them. Thank you!!!
*Thursday, September 20, 2012 at 11:32pm by Sally*

**Chemistry**

What is the heat capacity of 190g of liquid water? I came up with 794.96 but it says my sig figs are wrong? Help?????
*Wednesday, May 19, 2010 at 10:07am by B*

**ROUNDING**

It is pretty easy but I am not quite sure. Round 0.03095583 to the 3 sig figs. Is it 3.12 x E-2 The format is OK but the rounded-off number is 3.10 x 10^-2 2681
*Thursday, August 25, 2005 at 11:55pm by Nisar*

**Physics**

the teacher said something about doing the correct sig figs..im not sure if it applies to this, im so confused! 10.2* 7.5 =76.5? 27.1/5.31 =5.103578154425612?? 2.712 + 10.8= 13.512?
*Monday, August 24, 2009 at 8:14pm by Yulia*

**Chemisty (Sig Figs)**

so i am terrible at this. Round each number to 3 significant numbers. Can you explain? 1. 9845.42800 2. 1.548937675e12 3. 10.7771777425 4. 0.000045875 thanks:)
*Friday, August 20, 2010 at 7:39pm by Rebekah*

**Chemistry**

At 752.3 torr and 20.35oC, what is the density of argon in g/L? Report your answer with 4 sig figs I got 1.875 using d=PM/RT, but it says wrong. I don't know why... I appreciate your help.
*Sunday, April 20, 2008 at 9:34pm by Jennifer*

**physics**

The highest George can suck water up a very long straw is 2.0m What is the lowest pressure he can maintain in his mouth? Express to two sig figs
*Friday, September 7, 2012 at 1:41pm by george*

**rounding**

(a) 455 cal to joules thats 1 903.72 joules but i need to round it to 3 sig figs how do u do that?
*Thursday, September 9, 2010 at 7:54pm by jack*

**Chemistry(Please check)**

(0.80M)(5.00mL) = c2 (75.00mL) c2 = 5.33e-2 M Is the correct amount of sig figs?
*Sunday, February 26, 2012 at 9:32pm by Hannah*

**chemistry**

Calculate the amount of heat required to raise the temperature of a 16 g sample of water from 5°C to 12°C. Round to the correct number of sig figs. I got 5e3 and it was wrong.
*Wednesday, September 15, 2010 at 4:19pm by Rebekah*

**CHEMISTRY!!!!!!! HELP PLEASE:)**

How many kilograms of chlorine are in 24 kg of each of the following chlorofuorocarbons (CFCs)? 1) CF2CL2 express answer using two sig figs how would i solve for this problem??? thanks!
*Wednesday, September 7, 2011 at 1:32am by ALISON*

**Chemistry**

What should be the number of significant figures in the following calculation? It's an error calculation which is absolute value (True value - experimental value) / true value * 100 so it would be: absolute value [-601.7 - (-587)] / -601.7 * 100 Should the answer be 2.44 or 2....
*Tuesday, April 30, 2013 at 1:13pm by James*

**Physics**

The fisherman decelerates steadily to a stop in 20.6 s. What is the boat's acceleration, in m/s2, during this last portion of the trip? Initial velocity is 1.70 m/s. Use correct sig figs. The answer is not -0.0825?
*Sunday, September 14, 2008 at 6:32pm by Carmen*

**chem.**

Calculate the amount of heat required to raise the temperature of a 25 g sample of water from 5°C to 10.°C. i got 523 then rounded it to two sig figs 520 but it said it was wrong
*Wednesday, September 15, 2010 at 5:13pm by Rebekah*

**Chemistry**

Calculate the pH after 0.13 mol of NaOH is added to 1.00 L of the solution that is 0.57 M HF and 1.13 M KF. I got the answer of 3.66 to 3 sig figs, but it's wrong. Can you please tell me what I did wrong? -Thanks
*Sunday, March 27, 2011 at 3:02pm by Katrina*

**chemistry**

Ethanol has a density of 0.780 g/mL. What volume would 500. grams of ethanol occupy. Answer with correct number of sig figs
*Tuesday, January 31, 2012 at 7:05pm by kr*

**Chemistry**

For 0.06697mol / 0.1kg = 0.6697 mol/kg does my answer have the correct amount of sig figs? Same for 0.1004mol / 0.1kg = 1.004mol/kg ?
*Monday, February 20, 2012 at 10:38pm by Hannah*

**Physics**

What is the coeffecient of drag for the shape that has diameter 7.32[cm]? . Use three sig. figs. or N/A if there is not enough information. 2. You have a large wind tunnel of cross-sectional area 0.95[m2]. You have a set of shapes that are all the same shape except they each ...
*Sunday, April 7, 2013 at 1:37pm by Sean*

**chemistry**

1.64 L of a 4.95 M solution is diluted to form a 2.58 M solution. (Rounded to 3 sig figs) there are __________ L of the 2.58 M solution formed.
*Wednesday, February 5, 2014 at 11:15pm by Pooja*

**CHEMISTRY**

2H20(l) = 2H2 (g) +O2 (g) For the above, if 1.50 mg of water is decomposed, what mass of hydrogen is procduced? (1 mg=10^6g=1 metric ton)? I came up with 0.1678475161 and rounded it to .17 mg H2. Am I on the right track and did I include the correct amount sig figs?
*Tuesday, May 4, 2010 at 7:10pm by Carli*

**chemistry**

An antibiotic is sold in 4.0 mL ampoules that contain 60.0 mg of drug (60.0 mg/ 4.0 mL). How many milliliters of the antibiotic should be withdrawn from the ampoule if 20 mg are to be administered to a patient?Answer with the correct number of sig figs
*Tuesday, January 31, 2012 at 7:02pm by krystal*

**chemistry**

A patient has 0.050 L of blood drawn and this volume of blood has a mass of 55.0 g. What is the density of the blood? Answer with the correct number of sig figs
*Tuesday, January 31, 2012 at 7:01pm by k*

**chemistry**

A patient has 0.050 L of blood drawn and this volume of blood has a mass of 55.0 g. What is the density of the blood? Use correct number of sig figs 1.1?
*Wednesday, February 1, 2012 at 12:31am by kr*

**chemistry**

An antibiotic is sold in 4.0 mL ampoules that contain 60.0 mg of drug (60.0 mg/ 4.0 mL). How many milliliters of the antibiotic should be withdrawn from the ampoule if 20 mg are to be administered to a patient?Use correct number of sig figs 0.75ml?
*Wednesday, February 1, 2012 at 12:28am by kr*

**Chem 10**

Calculate the value of the following in exponential form, using standard scientific or "e" notation (for example, 105 = 1.05e2). Enter the correct number of significant figures. (2.700e2 cm)3 / (1.20e3 cm)2 Can't understand how many sig figs.
*Tuesday, January 18, 2011 at 1:42am by JoJo*

**Physics**

Platform area = 0.027[m2]. Wind Speed = 7.1[ms-1]. Air Density = 1[kg m-3]. Drag = 0.39[N]. Lift = 1.45[N]. Coeffecient of Lift = Use three sig. figs. or N/A if no answer. Platform area = 0.045[m2]. Wind Speed = 5.7[ms-1]. Air Density = 1[kg m-3]. Drag = 0.77[N]. Lift = 1.19[...
*Sunday, April 7, 2013 at 2:45pm by John*

**astronomy & space**

What is the redshift of a galaxy which lies at a distance of 50 mpc, asssuming that the hubble constant is H_0 = 67 km s^-1 Mpc^-1? assume that the speed of light is c=3.0x10^5 Km s^-1 please answer to an accuracy of 2 sig figs. Thankyou.
*Tuesday, May 5, 2009 at 5:21pm by mathew -b*

**chemistry**

You are traveling in a country that uses the metric system. Your child is sick and a nurse determines her temperature to be 40.8 ºC. What is this temperature in ºF? (1.8*40.8)+32=105.44 105 (answer with correct # of sig figs)
*Wednesday, February 1, 2012 at 12:41am by kr*

**CHEMISTRY**

Round this to three sig figs. 0.03335 Is it 0.0334? Is the rule: odd number goes up and even number stays the same? 3 is odd and is next to five...
*Saturday, October 26, 2013 at 1:45pm by Anonymous*

**chemistry**

How many grams of water would you add to 1.00 kg of 1.48 m CH3OH(aq) to reduce the molality to 1.00 m CH3OH. Use two sig figs. I get 4.8 * 10^2 grams and its not right. I want to put this up here again to see if there are any errors that could have possibly been made
*Sunday, February 21, 2010 at 8:00pm by david*

**chemistry**

How many grams of water would you add to 1.00 kg of 1.48 m CH3OH(aq) to reduce the molality to 1.00 m CH3OH. Use two sig figs. I get 4.8 * 10^2 grams and its not right. I want to put this up here again to see if there are any errors that could have possibly been made
*Sunday, February 21, 2010 at 8:36pm by david*

**Math**

Compute the following special functions. Keep the correct number of significant figures. 10^5.4 Can somewhere help me with this? Is it as simple as putting it into my calculator just like that? if so, how do I know what the correct number of sig figs are since the worksheet ...
*Monday, January 21, 2013 at 8:58pm by carl*

**Chemistry**

If 13.75 g of iron (III) nitrate react with an excess of ammonium sulfide, how many grams of iron (III) sulfide are produced? Report your answer to 2 sig figs
*Sunday, July 8, 2012 at 4:45pm by Stacey *

**math**

I always thought I understood significant figures...until I attempted to tutor someone. Some of the rules seem counterintuitive. For instance... 10.070 why is it 5 sig fig's? the "0" on the right is useless. without it the # holds the same value. 20 Why is it only "1" sig fig...
*Wednesday, January 30, 2008 at 6:07pm by Charles*

**Chemistry **

Calculate the ratio of the effusion rate of oxygen gas (O2) to that of nitrogen gas (N2). Express your answer in decimal form and calculate your answer to at least four sig figs.
*Thursday, September 23, 2010 at 11:17am by Mary *

**chemistry 30a**

What volume (in mL) of an 8% w/v acetic acid solution would be needed to form 2.2 L of carbon dioxide gas at 25.2 degrees Celsius and 0.9982 atm? Assume the acid is reacted with excess sodium bicarbonate, and round your final answer to two sig figs.
*Monday, March 12, 2012 at 9:14pm by sara*

**Physics**

1. You have a large wind tunnel of cross-sectional area 0.61[m2]. The wind speed is 4[ms-1]. Assume air density is 1 [kgm-3]. The Drag is 2.3[N]. What is the coeffecient of drag for the shape that has diameter 7.32[cm]? . Use three sig. figs. or N/A if there is not enough ...
*Sunday, April 7, 2013 at 1:40pm by Sean*

**chem**

158.5 mL of a AgNO3 solution at 5.0M was combined with a 3.5M CaCl2 solution. 110.5g of AgCl was recovered. Given that the CaCl2 is the limiting reagent, how many milliliters of the 3.5M CaCl2 solution was used? 2 sig figs
*Monday, November 29, 2010 at 12:29pm by Michelle*

**chemistry**

a 23.74 mL volume of .0981 M NaOH was used to titrate 25 mL of a weak monoprotic acid solution to the stoichiometric point. determine the molar concentration of the weak acid solution. express in correct sig figs.
*Monday, March 25, 2013 at 1:34pm by Anonymous*

**Physics (fluids)**

1. You have a large wind tunnel of cross-sectional area 0.61[m2]. The wind speed is 4[ms-1]. Assume air density is 1 [kgm-3]. The Drag is 2.3[N]. What is the coeffecient of drag for the shape that has diameter 7.32[cm]? . Use three sig. figs. or N/A if there is not enough ...
*Sunday, April 7, 2013 at 2:36pm by Robert*

**math?**

Give the answer to the following calculation with the correct number of significant digits. Report your answer in scientific notation. (6.17 x 10-1 + 4.9 x 10-2) x (3.95 x 10-2 + 6.454 x 10-3) i know how to solve for the answer, i just dont know the correct number of sig figs...
*Thursday, September 13, 2007 at 8:26pm by des. student!*

**chemistry**

In the reaction A to products, A is found to be 0.489 M at t=72.0 s and 0.468 M at t=82.2 s What is the average rate of the reaction during this time interval? Do I take the Ln (0.468/0.489) = -0.04395 / 10.2 = 4.3 * 10^3. yet the comp says its wrong. i have to put it to two ...
*Wednesday, February 24, 2010 at 2:15am by david*

**chemistry**

Some spacecrafts use hydrazine (N2H4) as fuel and is burned according to the following reaction: N2H4(l)+N2O4(g)=>2 N2O(g)+2 H2O(g) Calculate the DHrxn° for this reaction using the standard enthalpies of formation from Appendix IIB. Calculate your answer to 4 sig figs
*Monday, March 4, 2013 at 11:08am by Brandi*

**Chemistry**

magnesium is a valuble metal used in alloys in batteries and in manufacture of chemicals it is obtaine mostly in sweater which is about 1.3g mg for every kilogram of sweater assume that the sweater has a density of 1.03g/ml calculate the volume of the sweater in liters to the ...
*Wednesday, September 29, 2010 at 1:31pm by stacy*

**significant figures**

(2.34+7.9)/4.25 would this be 2.4 or 2.41?? would you do 2.34+7.9= 10.24/4.25=2.41 or would you say it's 2.4 b/c 7.9 only has 2 sig figs. or would you say 2.34+7.9 = 10.2/4.25=2.40
*Thursday, January 29, 2009 at 2:16am by mylinh*

**chemistry**

calculate the energy required to raise the temp. of 170.0 g of silver (specific heat = .24 joules/celsius times grams) from 273K to 301K. I know the equation and I got 1142.4 joules but need to get to 2 sig figs, so I converted it to 1.1 x 10^4 which is right, but it doesn't ...
*Tuesday, November 6, 2007 at 8:37pm by Avonlea*

**Chemistry**

The following data was obtained from titrating a solution containing 25 mL of 0.0100 M MgCl2 solution, 1 mL of NH3OH buffer, and 10 drops of Calmagite with EDTA. Calculate the concentration of EDTA. Report the answer with three sig figs. Please help it only shows a graph with ...
*Monday, May 13, 2013 at 6:07pm by shannon*

**MATH/CHEM PLEASE HELP!**

Give the answer to the following calculation with the correct number of significant digits. Report your answer in scientific notation. (6.17 x 10-1 + 4.9 x 10-2) x (3.95 x 10-2 + 6.454 x 10-3) i know how to solve for the answer, i just dont know the correct number of sig figs...
*Thursday, September 13, 2007 at 8:44pm by Jade*

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