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3 years ago

What is the amount of heat required to completely melt a 200

Chemistry

1 answer:

Snowcat [4.5K]3 years ago

7 0

A 200 what? Then I can help!

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ohaa [14]

Answer:

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3 years ago

Please help me very easy will biraly and 5 star and thanks

cestrela7 [59]

ITS 40 GRAMS I THINK

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3 years ago

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A lab team places 0.250g of an unknown solid acid in an Erlenmeyer flask. They neutralize the solid acid with 15.0ml of 0.210 M

Otrada [13]

Answer:

Molar mass of the unknown acid is 79 grams

Explanation:

We have to first get moles in 15.0 ml of sodium hydroxide solution:

${ \sf{1 \: l \: of \:NaOH \: contains \: 0.210 \: moles }} \\ { \sf{0.015 \: l \: of \: NaOH \: contain \: (0.015 \times 0.210) \: moles }} \\ { \underline{ = 0.00315 \: moles \: of \: NaOH}}$

since mole ratio of acid : base is 1 : 1, so;

moles of acid that reacted is 0.00315 moles of the unknown acid.

then we've to get molar mass:

${ \sf{0.00315 \: moles \: of \: acid \: weigh \: 0.250 \: g}} \\ { \sf{1 \: mole \: of \: acid \: weighs \: ( \frac{1 \times 0.250}{0.00315} ) \: g}} \\ { \underline{ = 79.4 \: g \approx79 \: grams}}$

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3 years ago

7. One mole of phosphorous pentachloride contains how many of each of the following:

RideAnS [48]

Answer:

a) 6.02 × 10^23

b)6.02×10^23

c)3.01×10^24

d) 3.612×10^24

In every mole of a substance there are 6.02×10^23 entities.

in ( c) there are 5 carbon atoms . 5 is multiplied by the number of moles of the molecule and then multiplied by 6.02×10^23. ( using the formula N=nL )

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3 years ago

What is dihydrogen sulfide made of

harkovskaia [24]

Answer:

Leguoilakčsu

Explanation:

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3 years ago

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