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Flauer [41]
3 years ago
5

Round 87.073 meters to 3 significant figures. Write your answer in scientific notation. Step 1: 87.073 rounds to ____. Step 2: w

rite scientific notation : ____ meters

Chemistry
1 answer:
Yuki888 [10]3 years ago
5 0
<span>Three significant figures would be 87.1 m In scientific notation it would be 8.71 x 10^1 m Significant figures tells you how many total digits to hold in the number, so in this case it is three, so we keep three total digits, but we round up the tenths position because in the hundredths is 7. In order to write in scientific notation, the mantissa (or significand) must be between 1 and 10. The magnitude is then denoted by a power, the power is calculated by how many times the decimal is "moved" if it is to the left to get the mantissa, then it is a positive number, if it is moved to the right, then it is a number smaller than 1.</span>
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Calculate the number of moles of caco3 (calcium carbonate, or limestone) in a 20.0g sample of this substance
Brrunno [24]
First calculate for the molar mass of the given formula unit, CaCO₃. This can be done by adding up the product when the number of atom is multiplied to its individual molar mass as shown below.

     molar mass of CaCO₃ = (1 mol Ca)(40 g Ca/mol Ca) + (1 mol C)(12 g of C/1 mol of C) + (3 mols of O)(16 g O/1 mol O) = 100 g/mol of CaCO₃

Then, divide the given amount of substance by the calculated molar mass.
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6 0
3 years ago
Convert 0.00200 g into Mg and answer in scientific notation:
Masja [62]

Answer: 2.00x10^{2}

Explanation: 1 gram is equal to 1000 Milligrams so

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5 0
1 year ago
Assume the molality of isoborneol in your product is 0.275 mol/kg. What is the melting point of your impure sample given that th
aliina [53]

Answer:

168°C is the melting point of your impure sample.

Explanation:

Melting point of pure camphor= T =179°C

Melting point of sample = T_f = ?

Depression in freezing point = \Delta T_f

Depression in freezing point  is also given by formula:

\Delta T_f=i\times K_f\times m

K_f = The freezing point depression constant

m = molality of the sample  = 0.275 mol/kg

i = van't Hoff factor

We have: K_f = 40°C kg/mol

i = 1 (  non electrolyte)

\Delta T_f=1\times 40^oC kg/mol\times 0.275 mol/kg

\Delta T_f=11^oC

\Delta T_f=T- T_f

T_f=T- \Delta T_f=179^oC-11^oC=168^oC

168°C is the melting point of your impure sample.

4 0
3 years ago
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