Chemistry, 19.07.2020 15:01 BWomack214

I'll mark you brainliest if you answer first! - Iron filings and copper (II) sulphate solution are mixed together and they produce elemental copper and iron (II) sulphate solution. Based on the quantities of the reactants used in the experiment, determine which is the limiting reagent. For the excess reagent, determine how much in grams is left over. (2 grams of iron was used, and 7 grams of copper

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Answer from: loudiema

First, write an equation for the reaction involved.

Fe + CuSO4 ---> FeSO4 + Cu

Now, calculate the no. of moles added in the reaction. (n.o.m. = mass /molar mass)

No. of moles of Fe added = 2 / 55.8

= 0.0358 mol

No. of moles of CuSO4 = 7 / (63.5 +32.1+16x4)

= 0.04386 mol

From the equation, the mole ratio of Fe : CuSO4 = 1:1,

meaning 1 mole of Fe reacts with 1 mole of CuSO4.

It also indicates that the no. of moles reacted in Fe equals to the no. of moles reacted in CuSO4.

0.04386 > 0.0358

The no. of moles of CuSO4 is higher than that of Fe, meaning all moles of Fe will be reacted while not all CuSO4 reacts.

Hence Fe is the limiting reagent, and CuSO4 is in excess.

All 0.0358 moles of Fe reacts, meaning the no. of moles of CuSO4 left unreacted = 0.04386 - 0.0358

= 0.0080596mol

mass of CuSO4 unreacted = 0.0080596 x (63.5 +32.1+16x4)

= 1.28g

Answer from: Quest

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).

Answer from: Quest

The answer to your question really depends on three things: how much water you have, how cold it is to start out, and how cold the things around it are. water actually freezes when it gets to 32 degrees fahrenheit (0 degrees celsius), but the time it takes to get there may be different. let's start with the first. if you take two glasses, and fill one with a tiny bit of water, and the other about halfway, then put them both in the freezer, the one with less water will freeze first (you can try this at home, but i recommend using plastic cups and not glass ones). now let's move on to the second part. let's say you have two glasses, and you fill one with really cold water that has been in the refrigerator, and the other with really hot water from the sink. if you put both of them in the freezer, the one that started out colder will freeze first. for the third part, let's imagine that you have two glasses with the same amount of water in them, and the water is at the same temperature. imagine putting one outside on a really really cold day in georgia, and having a friend in alaska put one outside on the same day. since it would be so much colder in alaska, the glass of water there would freeze before yours. so, if you took a tiny bit of really cold water in a glass, and put it outside on a cold day in alaska, it would freeze a lot faster than a big glass of hot water outside on a cold day in georgia.