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Delvig [45]
3 years ago
7

The half-life of cobalt-60 is 5.26 years. If a sample originally contained 220 grams of this isotope, how many grams would be le

ft after 10.52 years?
Chemistry
1 answer:
ser-zykov [4K]3 years ago
7 0

Answer:

Question Answer

The half-life of cobalt-60 is 5.26 years. How many half-lives have passed in 10.52 years? 2

12.5% of a radioactive sample are left. How many half-lives have passed? 3

After 3 half-lives, how much of a 400 gram sample of radioactive uranium remains? 50g

Explanation:

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timama [110]
They are made up of particles that are arranged in a repeating pattern.
3 0
3 years ago
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2Al + 6HCl → 2AlCl3 + 3H2<br> If 85.0 grams of HCl react, how many moles of H2 are produced?
Murrr4er [49]

Answer:

1.17 mol

Explanation:

Step 1: Write the balanced equation

2 Al + 6 HCl → 2 AlCl₃ + 3 H₂

Step 2: Calculate the moles corresponding to 85.0 g of HCl

The molar mass of HCl is 36.46 g/mol.

85.0 g × 1 mol/36.46 g = 2.33 mol

Step 3: Calculate the number of moles of H₂ produced from 2.33 moles of HCl

The molar ratio of HCl to H₂ is 6:3.

2.33 mol HCl × 3 mol H₂/6 mol H₂ = 1.17 mol H₂

8 0
3 years ago
A 5L sample of CO2 at 540 torr and 25 degrees celsius expands to 15L at 32 degrees celsius. What is the pressure of the new cont
saw5 [17]
By  use  of  combined  gas  law
 P2=  T2P1V1/V2
v1=5L
P1=540  torr
T1=25+273=298k
V2=15 L
T2=32+273=305  k

P2  is   therefore=(  305k  x  540 torr  x5 L) /( 15L  x  298)=  184.23  torr
6 0
3 years ago
Two compounds a and b have the formula of c3h6o determine their condensed structural formulas and name
lapo4ka [179]

answer attached in image

3 0
3 years ago
When using microscopes, what are the two variables that matter the most<br>i think its chemistry.​
PtichkaEL [24]

Answer:

magnification and resolution  

Explanation:

Two parameters are especially important in microscopy: magnification and resolution. Magnification is a measure of how much larger a microscope (or set of lenses within a microscope) causes an object to appear.

4 0
2 years ago
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